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."
"Oh, that's your typical gars en tabarnak right there."
by Mad_About_Thou January 24, 2010
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