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".
"Hey dude,I haven't seen you lately,how ya' been?"
response;"s.n.a.f.u.b.a.r."
Is used to signal to anyone else who knows the 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)