1. Another term for doing a fart
2. An expansion on the definition of a mythical noise that induces instantaneous bowel evacuation
Sniff, sniff.... "Did you just play a brown note? Oh yuck"
What are you doing honey?
Aww nothin....Playing a brown note
F.IF = Fart Induced Fit. The mad flailing of arms and nose pinching that happens as soon as a fart is smelt by the person unfortunate enough to be in the room when somebody else farts.
Hey man I did the best fart the other day but my girlfriend had a total F.I.F.
or, on seeing someone's reaction to your fart you can say
"Don't F.I.F out on me now!"