NORF comes from none other than OSCAR WINNING Three SixMafia/Hypnotized Camp Possee. It is short for (North)Memphis Tennessee. It is also a handshake they do where 2 people give dap and then raise their thumbs up.
Norf:
Project Pat (of HCP) Lyrics: NOOOOORF! RaiseYa thumbs up nigga. Repeat 4x