Reverse-Butt
A person that has a beer belly but has no butt
That person has a strange figure, it looks like a reverse-butt; a flat ass with a beer gut.
Reverse Butt Chug
To fill your mouth with alcohol, then blow the alcohol through a tube into a person's ass. Then suck the alcohol back out of the person's ass.
Man I totally reverse butt chugged out of your girlfriend's ass last night, and I got fucking smashed!
reverse butt-rape
smothering someone, using your own butt
I'll reverse butt-rape you in the face if you don't stop!