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The art of inserting one's penis into the beverage of a friend or acquaintance if they leave a room and their drink unattended at any stage. Usually perpetrated for comedic purposes.
John: Thomas just went to the bathroom there and the idiot left his pint behind. Mickey Dip?

Peter: Of course, in for a penny in for a pound, that arsehole deserves a knob in his drink.
by ss77 April 25, 2011
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