Top Definition
when a person enters a bathroom stall, takes a crap and leaves the stall faster than someone who has been in another occupied stall and is still crapping.
Joe: Have you seen Terran?

Gren: I think he isn't feeling well. I went into the men's room and shit lapped him.
by highyieldjoe November 04, 2013
1 more definition
You were so tired/pissed/hung over, that you shat yourself and it went on your lap
"Aww mate I was so Shitlapped last night"
by Klavdiya June 29, 2009

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