ThunderBOOTYclap

You slap one humanoid's ass and create a burst of thunderous sound that can be heard up to 100 feet away. Each creature within range, other than you, must succeed on a Constitution saving throw or take 1 d8 thunder damage. to do this spell you have to slap a ass within 5 feet of you, or else you can't do the spell

The spell’s damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).