(v) - to push so hard as to defecate in one's undergarments unintentionally.
Oh my God Larry, I think i just shit myself.
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.
Me: <Sniff, sniff>...what the fuck, who shit themselves?
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?
something Ive done and so have you.
This is going to be a picture finish. Dude you just shit yourself