a mix of 2 acronyms,s.n.a.f.u.(Situation Normal All Fucked Up) and f.u.b.a.r(Fucked Up Beyond All Reason),Which becomes "Situation Normal All Fucked Up Beyond All Reason".
Is used to signal to anyone else who knowsthe term that you have wood for no reason. "Hey, H.A.B.F.N.A.R., right now!" (while in a room full of unknowing people)