Top Definition
(1.)The act of farting. (2.)Farting In such an unspeakable manner.

or (3.)farting very loudly in a quiet environment.
1. dude whats that smell? i just let out a Butt-Cuss! ahhhh sick!!!!one11!1!!11eleven!1

2. I told you its unspeakable.

3. kid 1 "(butt cussing loudly)" librarian "shhh no butt cussing in the library! you fail at life! now take you pants off and bend over!"
by thebuttholeM4st3r July 03, 2009
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