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1.
frf
Not commonly seen, can be found when someone mis-spells "lol" to become "kik" (the letters directly left of it), then "juj", "hyh","gtg", and eventually FRF.

OR

Direct typo of "gtg".

lol
kik
juj
hyh
gtg
frf
by Marcus Quinn October 23, 2006
 
2.
FRF
Friendship/ Relationship/ or Fuck?

An initial greeting frequently used on social media to ascertain if a person is DTF, or looking for something else.
Similar to when people used 'ASL' on MSN back in the day, FRF is used on social meeting sites such as Facebook & Tinder to cut the bullshit and get straight to the point.

It's a way of asking, "what are your intentions?"
Castro: "FRF"
Kiara: "You have a hot body, I'm DTF"
Castro: "Yeah alright, it's gonna happen, I'll see you in 20"

Or

Johnny: "FRF?"
Jess: "I'm looking for a relationship"
Johnny: "You can have a relationship with my dick"
by FRF August 28, 2014
 
3.
FRF
Front Row Fucker
or as teachers know it, Front Row Fans...
Person 1: Are you going to the basketball game?
Person 2: Heck yeah! The FRF is gonna get crazzzyyy!
by elklover123 November 20, 2012
 
4.
FRF
An FRF is a front row faggot. These are the people in class that sit in the first row asking question upon question, primarily to act intelligent and/or point out mistakes the professor has made. An FRF is typically oblivious to the disdain of his or her classmates.
FRF: Professor, it says to always remember Euller's constant when integrating. Is this the same as Euler's constant?
by sontin0 October 20, 2011