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1.
A Canadian Facepalm occurs when a girl slaps a man, during sex while on their period, with a combination of their own blood and the mans semen.

NOTE: the man can return the slap, but this really does no good as the girl will probably wipe the fluid on the bed and thus cause the man to have to buy new sheets.
Josh was having sex when his girl decided to give him a Canadian Facepalm. Josh was not amused.
by IsThatARetoricalQuestion June 02, 2010