One who has such a voracious appetite for cock he will do anything to get his hands on cock.
The cock mugger noticed the man was holding his cock
loosely, and so, with dastardly intent, the miscreant snatched the cock out of the man's hand, and ran down the street.
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.
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