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Whack a dog means jacking off a dog.

Strangely enough this can be a profession.
After coffee break at the AI clinic, Camilla sighed, put on her gloves, and went off to whack a dog.
by scodder August 07, 2010
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Aug 4 Word of the Day
Man's greatest invention, brain bleach removes bad memories and general DO NOT WANT moments. Every household should have a few gallons.
1: Dude, I just walked in on my parents.
2: Have some Brain Bleach!
by Andikun November 06, 2007
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