Crater Ass 

When one's ass appears to be inverse from typical proportions
It appears to be completely flat or even inverted compared to a typical rounded and/or rotund ass
Shaped perfectly for sitting atop a giant ball

"That guy has no ass, like - It's MISSING! What a Crater Ass!"

Crater Ass by Damien AKA "Uncle Ruckus" September 10, 2020

Asscrater 

The little divots and wrinkles on fat peoples butt cheeks that you cant help but notice.

We went to the lake and saw a fat lady who had the biggest Asscrater on her rump.

Asscrater by NICKAPLEZ March 25, 2009

New Years Asscraker

On New Years eve, when it is 1 second away from the New Year, one lets out an Asscraker, which is a fart that is in sync with the firecrakers outside

Tim: Its almost 2010!
Jarry: Yah, I think I am gonna let off an New Years Asscraker!
Tim: Nice I'll think I'll do the same.

New Years Asscraker by firecraker098 December 30, 2009

ASSCRATER 

Noun: Similar to an ASSHOLE but much more extreme.

Dick and Virgina Johnson constantly receive the "ASSCRATER of the Party" award due to their rude and selfish behavior toward other people!

ASSCRATER by Dr. Real Nasty January 24, 2023