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1 definition by The Heatmeiser

 
1.
The act of straddling over another's body that is sitting on the toilet while both people defecate into the toilet and gaze into each-others eyes. The act is supposed to look like spider legs hanging from a toilet thus giving it the name spiderpoop.
Guy: Hey, lets do something neat.
Other Guy: I know, lets spiderpoop.
Guy: That sounds groovy man.

Dude: I just spiderpooped your Mom last night.
by The Heatmeiser January 10, 2012