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!!"
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