poop your shirt

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!"

Poop Your 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