Top definition
An act of exemplary absent-mindedness.

The expression is derived from the occasion when one urinates into a receptacle in the bathroom other than the toilet due to not paying attention to one's actions or surroundings.

See: Cheech and Chong's Up In Smoke.
How did John miss that exit? He must have been pissing in the bin.
by iamnotoriginal August 25, 2010
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