When a person releases a particulary nasty smelling fart into the room.

a fart which is released from the buttocks, which could be described as being toxic.

hence the name buttoxin.

Butt + toxin/toxic = buttoxin.

Jim: *loud fart*

Jenny: "eugh, that smells disgusting!"

Jack: "that's toxic man."

Jim: "that's a true buttoxin!"

Jenny: "so nincompadrae!!"

Buttoxin by ClareyMcfarey :) March 2, 2010

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Buttoxing

The act of putting ones bare butt against someone when they are not expecting it.

Yo dude i was totally daydreaming and then before i knew it he was buttoxing me.

Buttoxing by buttoxmaster4 December 11, 2011

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buttoxin

The substance or stain left in ones underwear when a fart is mixed with diarrhea.

The buttoxin in your underwear just won't come out.

buttoxin by Roland Warren October 30, 2006

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Buttoxins

Toxic gas, liquid or solid from someone's buttocks.

I could smell someone's buttoxins in the elevator.

Buttoxins by Jack P August 10, 2014

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