When you get so drunk, you actually, literally, crap yourself like a toddler.
Thursday night I wore my white corduroy pants out to the bar. I didn’t know my white corduroys would soon become my shit pants. I got so boozed, I stole my friends shoes and barfed in them. Then I shit my pants...Thursday night I was Shit-Pants Drunk.
National Shit Your Pants Day, which takes place on April 28, is a regularly-celebrated holiday in the Midwest Region of America, most likely devised by clothing companies to sell replacement underwear and pants to partakers.
David: Why're you eating so much?
Mark: Tomorrow is National Shit Your Pants Day, I want to celebrate it with my girlfriend. Every year we shit each other's pants.
David: Romantic