buttbate 

The act of violently shoving your thumb into your asshole and shitting as you do it, this is usually done for sexual pleasure. (Male or female)

Me: Dude, I just buttbated, it was amazing.
Billy: Does your thumb stink?
Me: (Sniffs thumb) FUCK YES! There's fucking shit all over my hand! I forgot to clean up I guess...

buttbate by DeuceCracka January 22, 2014

buttmate 

someone who sits behind you in an office or class. They are postioned so that you seldom see their face but who shares an area but try not to touch.

Yo cuz whose your buttmate in class?

buttmate by beaver60 February 3, 2007

buttbagel 

An abnormaly developed anal sphincter in state of contraction

That's the nicest buttbagel I've seen since yesterday

buttbagel by yidele January 17, 2003

Buttbare 

Buttbare means when someone is being rude or inappropriate to you

“She was being very Buttbare last night”

Buttbare by Ebl February 8, 2020

Rainbow Buttmate 

The dude you go to prom with.

'Yo who you going with for prom'
-'oh, josh. We're rainbow buttmates.'

Rainbow Buttmate by 'Filthy Mortal Child' June 10, 2018

buttwater 

An ugly, hairy person who has no hygene.

Michael is the biggest buttwater in the world.

buttwater by Sexy Unanymous May 17, 2006

buttbagery 

the act of being a buttbag

Alan, I have had it up to here with your buttbagery! you are fired!

buttbagery by mikeyd1978 October 22, 2011