Nick and Jeff Warbler's (from Glee) fandom-made couple name.
Person on livestream: Do you ship Niff?
Nick: ...*huge smile*
by GeeUrie February 10, 2012
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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
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An English 50 pence piece. Hand in hand with biff
Mr D's sell large chips for a biff niff
by Will Satterthwaite May 30, 2005
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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
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eg. at my school when someone is by their self we call them a "niff" as they are alone
by sam November 24, 2003
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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 April 30, 2012
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