Peepee Domain

The PeePee Domain is an absolute shitpost, but clerics who follow this path are plentiful if your DM is cool. Clerics of the PeePee Domain are valiant heroes who have either the intellectual maturity of a raisin, a watersports fascination, or both. The gods of Piss hold dominion over the natural processes of the body, including particularly the latter end of the digestion cycle. Gods of this domain include Bear Grylls, Sniper TF2, Dr. Eggman (from the fandub), Terraria players who choose Crimson instead of Corruption, and Thomas. Priests of these gods encourage healthy hydration and frequent urination, and those that choose the path of the warrior utilize pants-wetting battle tactics and drenching magic attacks.

Bonus Proficiency

When you choose this domain at 1st level, you gain proficiency with heavy armor.

Ichor Sticker

Starting at 1st level, whenever you hit an creature with a spell attack, you can cause that creature to need to go pee really badly. A creature affected in this way has its movement speed halved, and has disadvantage on attack rolls until the beginning of your next turn.

You can use this feature a number of times equal to your Wisdom modifier (a minimum of once). You regain all expended uses when you finish a long rest.

Channel Divinity: Potty Dance

Starting at 2nd level, you can use your Channel Divinity to evoke your foes most primal urge: the potty dance. 

As an action, you present your holy symbol. Each hostile creature within 30 feet of you must make a Constitution saving throw. A creature under the effect of your Ichor Sticker feature has disadvantage on this roll. On a failed save, a creature immediately wets its pants. On a successful one, a creature must make a Constitution saving throw each time it receives damage for the next minute to avoid wetting itself, squirming uncomfortably to hold back its bowels. If a creature cannot urinate, it excretes whatever fluid is appropriate. Regardless, a creature that fails one of its Constitution saving throws is subject to the effects of pissing itself.

Creatures that have pissed themselves are afraid of you, and attacks made against these creatures deal an extra 1d4 psychic damage on a hit for the next minute.

Jarate

Starting at 6th level, whenever you use your Ichor Sticker feature, attack rolls against the targeted creature have advantage for the duration.

Man vs. Wild

Also starting at 6th level, you never feel thirsty, and you never suffer the drawbacks of dehydration.

Blessed Strikes

I Pissed on the Moon, You Idiot!

Starting at 17th level, your godly bowels cannot be contained. As an action on your turn, you release a mighty piss laser 5 feet wide and 500 feet long. A creature in the path of this laser must make a Dexterity saving throw to dodge it. The Laser continues until it hits either a creature that failed its Dexterity save, or a stationary object or barrier. Upon hitting something, the laser deals 10d10 force damage to its target, and piss droplets rain down upon the ground, drenching everything within a 30 foot radius.

Drenched creatures have disadvantage on all saving throws until they find a way to clean themselves. Once you use this feature, you can't use it again until you finish a long rest.