Top definition
The act of a man and a woman having vaginal or anal sex while the male is in the act of defecating. While the man is seated on the toilet the woman mounts him face to face with her legs extending toward the tank or wall. The legs of the intertwined lovers resembles a spider.
My girl walked in while I was taking a dump and gave me a spider slam.
by themooserislooser November 10, 2010
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