G'Donk-A-Donk
Your butt is so big it’s like your pants have a second job. They’re making donkey noises just to keep up.
My pants are so full of butt they’re doing a donkey impression.
My friend’s pants donk-a-donked so loud it woke up the cat.
I walked into class and my pants made a donkey noise in the middle of the math test.