When someone is in a particularly foul mood first thing in the morning. Many people will have a cup of coffee before anything else is taken care of. Therefore their coffee must have been pissed in to start their day off so badly.
Joe: "Hi Jack! Wonderful day isn't it?"
Jack: "Ah fuck yourself you fucking fuck!"
Joe: "Well who pissed in your coffee this morning asshole!"
Jack: "Ah fuck yourself you fucking fuck!"
Joe: "Well who pissed in your coffee this morning asshole!"
by Jumpingrat March 29, 2007
Get the who pissed in your coffeemug.