Shorthand abbreviation for 'follow-up', typically used in electronic communication, to indicate that a subsequent discussion should occur or has occurred on the topic in question.
Person 1: "Did you want to talk about last night?"
Person 2: "Yes I did. I was hoping we could f/u on the fact your sister is stupid whore."
Person 1: "Oh yeah, bitch? Fuck you."
by T_Whatevers May 30, 2011
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follow-up: to pursue in an effort to take further action
"Thanks for the f/u. I can always count on you to resolve my concerns promptly."
by Veggiecat March 16, 2007
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a short way o saying "FUCK YOU" for the lazy ass people like me
by sean bucher September 12, 2004
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"All Fucked Up". When something has been totally messed up. Also see SNAFU
"After breaking his wrist, his pool game is A F U"
by Matkowitz April 05, 2008
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Current WWE champion John Cena's oh-so-intimidating finisher. An overglorified standing fireman's carry.
Typical announcer over-reaction:

OH MAH GAWD! It's the F-U! Cena picked him up on his shoulders, and dropped him to the ground! A lesser man would have died from such an attack!
by El Toro Grande October 03, 2005
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