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1.
its basically when u stomp on a piece of poop really hard splattering it on everyone around you.
Thank god i was wearing a trench coat when i pulled that massive poop stomp on those nerds
by poop eater March 11, 2005
 
2.
the act of filling ones sock with fecal matter and slamming it across their face.

poop stomping can also be attained while on X-Box live and someone repeatably kills and taunts you.
"dude why did you sign off last night?"
"because dude i kept gettin poopstomped"
by Taintgobbler February 13, 2010