The left over remnants of a miss aimed wipe after taking a crap. Where the front edge of the TP gets caught between the sticky moist surface of you inner ass crack and the wipeing motion of you dominant shit cleaning hand. Then breaks off lodging itself in between your butt cheeks, only to be deployed at an embarrassing momment (e.g, droping your pants in a public restroom, gaping your ass in the doggystle position, or playing trickery on a TSA officer as they spread you for inspection and they think they have a winner)
I just found a butt blunt on the floor of the bathroom at work
by Tinabiotch September 26, 2015
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The act of sticking a joint of weed in someones ass on April 20th, and smoking it.
John: Hey, Seth, bend over please.

Seth: Why the hell do you want me to bend over?

John: Calm down man, I'm just gonna smoke a Four Twenty Butt Blunt out from your ass.

Seth: Oh. Ok.

-Mike Zeeeeeeeeeeeeeeeeeeeeeee
by o DubBZzy April 20, 2010
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