nalgarhythm
When your butt cheeks move like they’re doing a dance, and it’s so smooth you could swear they got a degree in butt-butt rhythm.
My mom’s butt does a nalgarhythm every time she walks into the kitchen.
That guy at the gym has a nalgarhythm so good, it’s like watching a show.
I tried to do a nalgarhythm in my pants, and it didn’t end well.