pop a fatty

to get an excessively large erection very suddenly.

*Samantha walks past*
Mario: Damn.

Alex: Did you pop a fatty?

by professor finessor June 02, 2017

Pop a fatty

To take a fentanyl pill; to ingest fentanyl in any method.

“Yo, this party really ain’t that great. You tryna pop a fatty so it starts feeling better?”
“Dude, I’m not taking fentanyl. It’s literally a grad party in the middle of the day.”
“Man, you just ain’t about it.”

by surfinchezcube May 02, 2021