the mimic spits out a goldfish in a knight helmet, and on the tank it says: Sir flipper

I feed the mimic the wand of smiles

The Mimic smiles at you, and the Wand of Smiles has made its teeth shine so bright you take 29 radiant damage and you're now temporarily blinded. The Mimic then spits out the Staff of Frowns.

I feed the Mimic a dwarf's hip bone.

It spits out an elf's hip bone. 

I feed the mimic a normal burger

(Actually, pug I think it's the 5th time I've been eaten)

The mimic burns with an unholy rage. It glares at you with the fury of the gods in its eyes. Your body is split into 1 billion pieces. All 206 bones snap at the same time. Your body burns and melts, you catch fire and freeze at the same time. You instantly die. (My description of the Disintegrate) 

I feed the mimic a normal hotdog.

(Edit: I feed the hotdog to the mimic by sticking my hand out of its mouth and dropping the hotdog in)

The Mimic glares at you intensely. In its eyes you see strange flames that glow black instead of red and yellow. Soon, all your metal belongings glow red hot, scorching your skin horribly. The scorched skin begins to peel from your body in sheets, and at the same time, you are over taken by a debilitating cold that freezes your limbs and makes it hard to keep going. This then causes all of your burned skin to freeze to your body, making you look horribly deformed. After all of this, the Mimic still feels that it hasn't done enough. It then runs toward you, jumps up, and devours you whole as it comes down. (Me describing Heat Metal, Frostbite, and the Mimic eating you.)

I feed the Mimic a bowl of cereal.

Given that the cereal isn't normal the mimic eats it happily.

I use my portable hole to leave the mimic and then I feed it some cookies. These cookies are actually cards from the Deck of Many Things. I baked them into cookies.  I also draw one of the cookies. Its moon. My first wish is that I am healed to full health.

you are cured of diseases, ergo full health.

I shoot you with a GLOCK and re-feed you to the mimic. SIX TIMES LESSSGOOOOOOOOOOOOOOOOO

The mimic looks queasy, and chokes on shadowlander. It barfs up the animated skull of a dragon, and the skull eats you.  

I throw in a winged kobold

The mimic spits out a 50000-page Homestuck fan fiction.

I feed the mimic the Shadow Cabinet of Britain.

(Pug that was the seventh time. Read the post by AgateElk above).

The mimic gets so confused that it spits out the Shadow Cabinet of Britain and eats you.

I crawl out of the mimics mouth again. Set up a loony toons machine to feed the mimic from 30ft away and feed the mimic a Get Out of Jail Free Card (IRL Version).

Quote from ShadowLander >>

(Pug that was the seventh time. Read the post by AgateElk above).

The mimic gets so confused that it spits out the Shadow Cabinet of Britain and eats you.

I crawl out of the mimics mouth again. Set up a loony toons machine to feed the mimic from 30ft away and feed the mimic a Get Out of Jail Free Card (IRL Version).

you hear a scuffle, as every living thing that the mimic has eaten fights over it. eventually, the mimic spits it out, straight at your machine, altering it so that it puts you into the mimics mouth. (the mimic mumbles sorry, as it was an accident)

i feed the mimic a scholors pack

(Now I need to see if I can get eaten ten times. Which means now that I said that I won't be eaten. Which now that I said that I will be eaten. Which means now tha...)

The mimic grows legs and goes to college. He stays there for 2 years before getting a "Idk Best Scholars Award For Mimics I Guess." He comes back laughs at you for dropping out of college. The mimic adds two to his intelligence and three to his wisdom. He also levels up to level 11.

I feed the mimic a Diploma. (After I and the mimic went to college together. I got out of its mouth during breakfast of the first year)

the mimic spits out a dip-loma, aka dips some guy named loma into water.

I feed you to the mimic

The mimic does not accept this as I am now his friend. He eats you instead! Dogs taste better anyway.

I feed the mimic a Av. O. Cad. O🥑.

It spits out toast. 

i feed it cinnamon

Spits out pepper.

I feed it salt.

its too salty. so, it eats you as you are no longer its friend.

I calmly tell it to barf you and then clean you and turn you into a banquet. and give it to the mimic.(8 times. yezzzz)

The mimic does not eat the banquet. It seems to have gotten bored of the taste of ShadowLander. It decides to eat Pug instead (the tables have turned, eh? Muahahahaha) the mimic, happy with the meal, spits out a pug-dragon hybrid for the next poster to ride.

I feed the mimic the eye and hand of vecna.

(Pug I was at 8, you fed me twice in that post so now its 10 not 8)

The mimic grows a hand that has an eye in the palm. The mimic is now a legendary creature. As a bonus action, he can look at you and you die. He looks at the pug-dragon hybrid. Cue audible splat.

I feed the mimic somebody with demon face syndrome (A real thing, look it up).

I seoson shadow with grated dragontamer. yum. and feed you to the mimic, not befor it vomits p one of every kind of demon. i promptly feed them too.