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.

Niff 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

Niff by Will Satterthwaite June 5, 2005

niff 

To sniff and lick at the same time. usually done by a man to a womans vagina.

I want to niff your vagina

niff by dark lord poon January 4, 2009

niff 

A word to say when you don't know what else to say, especially when bored.

"niff"
"your a niffpot"

niff by niffpot September 25, 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

Niff by sam November 24, 2003

niff 

a great person hu is fun 2 b around n always cumz up wi random topics ov conversation. it is normally a blonde and short female hu is great 2 have around!

e.g. ow are ya niff
niff what r u doin??

niff by niffnat December 28, 2007

niff 

in the state of being or appropriating a c**tsniff. A person of this quality.

Don't touch me, you niff.

Nev is a big fat niff.

niff by hkn pste December 10, 2003