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1. RFN
When tomorrow or this afternoon or later is not good enough: you need it Right Fucking Now.
Hey, you lame hesher, go get that six-pack RFN!
by Ace Jun 2, 2004 add a video
2. RFN
Really fucking nice. The top of the spectrum, above PFN (Pretty fucking nice) and NFN (Not fucking nice).
"Did you take that girl home last night?"

"Yep."

"RFN!"
3. RFN
Random Fucking Ninja. A term occasionally used in message boards and forums as means of a random assault on another member.
User 1: Stop posting stupid shit.
User 2: Fuck you! RFN attacks!
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