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1.
Someone in a constant bad mood.
O, you alright Noif
Por MichaelKalugin9 22 de marzo de 2010
 
2.
"Nerf" as pronounced in Brooklyn, NY
He hit me with a noif ball!
Por stobbchi 18 de julio de 2011
 
3.
to drink coke or any soda, without opening it's cap fully.

It stands for:
Not Opening It Fully

Many people who noif, tend to have long lasting drinks. And they are also considered "kool" by their peers.

Origin of it is not clearly known, however some noifers have said that it originated in inner-melbourne suburbs.
Dude 1: Whats that style of drinking called?

Dude 2: itz called noifing manz, only kool people do it.
Por Jman23 26 de abril de 2005
 
4.
to drink without opening the lid of the can fully. which leaves a little gap.
Jaz: thats so kool manz.
GEZ: YOU SHOULD TRY IT, EVERYONE LOVES TO NOIF.
Por Ganod 26 de abril de 2005
 
5.
you a loser open your drink!!
dont noif it so fuckin gay
Por David_is_Fat 28 de abril de 2005