gars en tabarnak 

This is a french-canadian expression to denote a man who is mad with anger. Such a man will usually be blunt, offensive, unkempt, disorganized and drink heavily.

"What's the deal with that guy? He hasn't said a thing except angry grunts since he got here."
"Oh, that's your typical gars en tabarnak right there."

gars en tabarnak by Mad_About_Thou January 24, 2010