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1.
(v) - to push so hard as to defecate in one's undergarments unintentionally.
Oh my God Larry, I think i just shit myself.
by Ryan February 29, 2004
 
2.
The release of such an ungodly fart that its potency and duration make those around the farter believe that the farter did not merely fart, but indeed shit his pants. Usually either an insult at the farter's discourtesy in not leaving the room, or a proud boast to indicate the true power of methane.
Them: pffft

Me: <Sniff, sniff>...what the fuck, who shit themselves?
by NoLeadEmSoMuch July 28, 2004
 
3.
To release of sh*t/crap/poo without removing your clothing, usually your pants and/or underpants.
Joe: Ugh! What's that smell, Larry did you shit yourself?
Larry:Uhhh, yeah?
by UrbanLegend1234 March 21, 2010
 
4.
something Ive done and so have you.
This is going to be a picture finish. Dude you just shit yourself
by shesunlucky October 30, 2007