Niff

Nick and Jeff Warbler's (from Glee) fandom-made couple name.

Person on livestream: Do you ship Niff?
Nick: ...*huge smile*

by GeeUrie March 22, 2012

Niff

Niff is a street name for poppers.
also used for sniffs,

pass me the niff mate

ive only had 3 niffs

by agatha chris June 15, 2009

Niff

A shortened version of the word "Niggerfaggot"

omfg, you are such a niff

See also pineapple

by littlepancake April 25, 2010

Niff

Jack-off into the hand of someone, and get it all nice and sticky. Tickle the person's face with a feather or such and see what they do...

to niff someone, to be niffed, or I am niffing.

by Rob February 18, 2004

Niff

An English 50 pence piece. Hand in hand with biff

Mr D's sell large chips for a biff niff

by Will Satterthwaite June 05, 2005

Niff

someone who is a loner

eg. at my school when someone is by their self we call them a "niff" as they are alone

by sam November 24, 2003

niff

boolean inverse of the function iff, equivalent to xor
same as nand or nor

0 niff 0 =0
1 niff 0 =1
0 niff 1 =1
1 niff 1 =0

by geek_1024 October 06, 2012