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."
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