Shit Yourself 

(v) - to push so hard as to defecate in one's undergarments unintentionally.

Oh my God Larry, I think i just shit myself.

Shit Yourself by Ryan February 29, 2004

Shit yourself 

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?

Shit yourself by UrbanLegend1234 March 21, 2010

shit yourself 

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?

shit yourself by NoLeadEmSoMuch July 28, 2004

shit yourself 

something Ive done and so have you.

This is going to be a picture finish. Dude you just shit yourself

shit yourself by shesunlucky November 19, 2007

Shit yourself, have I?

Fairly ambiguous and is often open to debate on it's correct application.
Historically it has been used to politely ask someone at, say, a formal dinner, if they have farted or indeed, have actually shat their smalls. The use of "have I" helping to ease the embarrasement of the situation.

"excuse me, would you pass the gravy"

"certainly, my pleasure"

(sudden smell of shit is apparant)

"pardon me, but shit yourself, have I?"

Shit yourself, have I? by ANNA! April 5, 2020

Shit yourself (SYS) 

When you are giving birth and you are pushing so hard you "shit yourself."

Sorry guys, you can't watch my birth video cause I shit myself.

Shit yourself (SYS) by Marie February 20, 2004

Shit Yourself Day 

Fuck yes, it’s November 4th SHIT YOURSELF DAY

You deserve a break, don’t go to that silly toilet

SHIT YOURSELF!

Betty: I really need to shit...

David: It’s Shit Yourself Day

Shit Yourself Day by JoeMama GOTEMMMMM October 17, 2019