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3.
f/u
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
 
1.
f/u
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
 
2.
F/U
Stands for "follow up."
I will f/u with what they said in a few days.
by California Love Baby July 12, 2005