ass grind
A skateboarding term for a category of bail which involves the skater sliding quickly across a surface on his buttocks. This usually results from a poor landing from a ramp, lip or rail, or due to the skateboard biting on an irregularity on the street surface.
Joe was leaning back too far when he came off that rail and ended up doing a huge ass grind.
Daily Ass Grind
The girl with the gorgeous ass as work that makes the daily grind worth it.
Oh that sweet daily ass grind just walked by, I love my job.
Ass Dip Wall Grind
Pile driving someone in the ass upside down against the wall
Oh man, Jerry gave me such a rough ass dip wall grind last night in kids bedroom.