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

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

Buttmare 

A terrifying or very unpleasant experience or prospect for a person's anus, usually involving gastric distress and/or poor choices of food ingestion.

"I ate lunch at Town Topic today and it did not result in my customary mid-afternoon BUTTMARE."

Buttmare by afghan_w October 12, 2011

buttmaster 

"buttmaster" is a new zealand slang term for someone that is considered to be very good at everything s/he tries. usually exceptionally good looking with chiseled features. a buttmaster is typically found inside a pub.

ben the polak is such a buttmaster that i've never seen him fail anything he has tried. he has chiseled good looks too.

man, you're a real buttmaster aren't you.

buttmaster by jimmy the thompson March 22, 2007

buttmagellan 

One who explores the high seas of Uranus.

That buttmagellan needs more seamen on his poop deck.

buttmagellan by Ferdinand Buttmagellan March 18, 2011

buttwater 

An ugly, hairy person who has no hygene.

Michael is the biggest buttwater in the world.

buttwater by Sexy Unanymous May 17, 2006

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