(n.) when a person has a fever, relatively high, and sweating it out won't work, it's called a PATD1. Referring to Panic at the disco's first CD, A Fever You Can't Sweat Out.
Sam: David called in sick today, he has a fever.
Arty: How bad is it?
Sam: It's a PATD1.
Arty: Yikes, I hope he get's better.