Top definition
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
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2
When one person is sitting on the toilet pooping and another person sits on their lap facing them and poops at the same time.
If we were in love we would spider poop.
by Jessica ;p September 19, 2008
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