Acronym for "No Fairies Necessary," an allusion to Nintendo's popular Zelda games. In Zelda, one can capture up to four "fairies," which revive the player's health immediately upon death. The acronym NFN ("no fairies necessary") is an arrogant way of saying that a task was accomplished easily, as in, without any fairies required to accomplish the task.
"How did you get that huge scar on your leg?"

"Oh, it was a car accident, but I handled it NFN."
by schazers August 29, 2009
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Not fucking nice. The bottom of the spectrum, below PFN (Pretty fucking nice) and RFN (Really fucking nice).
"Did you take that girl home last night?"

"No, her friend cock-blocked the hell out of me. It was NFN."
by MDIGFH March 31, 2009
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