The ghetto version of the word "pissing."
When someone is spazzing/seizuring/cussing, this word may be used to describe them.
"I was pissan myself laughing about EUNICE yesterday."
A term to make fun of Nissan cars. Especially when in a bad condition or quite old.
This word is also used in other languages, like German, with the same meaning. (In Germany Nissan cars have a very bad image.)
Also occurs in the PC-game "Painkiller", since the developers didn't have the permission to add Nissan Cars to the game, so the batch was changed to "Pissan".
What car does he drive? I don't know, some kind of Pissan or something.