tv. to strike one's head. : He bonked his head on the shelf.
tv. to strike someone on the head. : I bonked John on the head.
tv. & in. to copulate [with] someone. (Usually objectionable.) : She bonked him all night. At least that's what he said.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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