1. To bullshit, especially when one does not know anything about what one is speaking about.
2. To make a "brain fart," as it were; i.e. forgetting momentarily that Abe Lincoln was assassinated and thinking he died of a bone disease.
1. "Did you know that 83% of Americans can't find the U.S. on a world map?"
"Dude, you're totally poopin' your shirt!"
2. "He's not from England, he's from Britain!"
"You always poop your shirt like that, asshole!"
What you get for not lifting your shirt out of the crapper when you take a dump.
Evan didn't pull up his shirt when he went to go take a crap so it got all over his shirt. Now he's walking around with poop shirt.
When you suck at something so bad that you’ve done past pooped your pants! The poop has now entered the shirt region!
You can do no worse that pooping your shirt!
Poop your shirt: Verb.
To do a task so terrible that it’s compared to an infant dedicating all over themselves
Ex: Man, I really pooped my shirt on that last test!
Ex: Good Luck, Don’t Poop Your Shirt