1) To gag, vomit, or pass out while working with additional protective gear being worn. EX: A Fireman dressed for fighting fires, Soldier in a chemical suit.
2) To fake definition 1.
History: This definition is born from an individual in the military whose actions stopped a military exercise for the entire base. To recognize his actions, "Friehoffing" is now military jargon on his base.
Mechanic: "Sargeant, were stopping the convoy?"
NCO: "Yeah, the coreman found someone passed out in the formation. But I think he's just friehoffing."