A common camping term for dirt or sand that gets stuck in your skin, making you look dirty constantly even if you’re cleaned yourself up. it stands for “Permanent Dirt”
When a person with sever flatulence sits on upholstered furniture and the vapor of their farts have permeated the fabric to the extreme that no amount of cleansing or odor remover can remove the smell.
In poker an extreme form of tilt that can be produced by taking an exceptionally bad beat. The implication is that a player receiving such a bad beat will be so emotionally disturbed that they will play recklessly for the rest of their lives (permanent + tilt). While no unambiguous examples of the phenomenon have ever been reported the term is frequently used to indicate extreme emotional distress at the poker table.
"I get all-in versus this donkey with AA and flop quads. He's playing The Kat and runner-runners his miracle cards to make a straight flush. I've been on permatilt ever since."