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5.
NF
An abbreviation of "Not funny", used primarily as internet slang.

Used first by Chris G. in a conversation with Eileen m. (bah)
"but i did help u get over that malaysian girl didnt i?"
"i guess."
"don't worry, after a couple one-nighters you'll be ok."
"wtf, i'm no slut!"
"haha, JK!"
"NF!"
by chris gian May 05, 2008
 
1.
NF
means "Not Frat"
That GDI is wearing cargos. That's NF.
by UF Sorostitute September 09, 2010
 
2.
nf
Now Following, a commonly used twitter hashtag
"#nf @twitter_username"
"About time. #nf @username This fellow is the shit."
by theunimpossible December 11, 2011
 
3.
NF
A more polite abbreviation of the deragatory term Nigger Faggot.
Sarah: Jesus this school is full of NFs.

Shannon: I know right!
by Flare_Fuchs September 19, 2010
 
4.
NF
Not fuckable
Omg he's so fat, definitely NF.
NF comin thruuuu
by Ytyhsbyjcd2 July 22, 2014
 
6.
NF
Not Funny!
1) Someone online makes racists jokes.

You reply with NF.

(In the 70's there was a racist political party in the UK they called themselves National Front or NF. This is a sarcasm to the NF.)

2) You fall over break your leg and are laughing.

You reply with NF.
by voodoo666 September 15, 2009
 
7.
NF
A short abreviation for Niagara Falls.
Person 1: "Eh yo, you been in NF Lately"
Person 2: "Naw, I like to stay within the T-Dot."
by Mistah T February 17, 2008