WORD TO BE USED IN PLACE OF ANY NOUN THAT IS NOT IMMEDEATELY THOUGHT OF. THAT IS, UNTIL A PROPER NAME CAN BE REMEMBERED.
Hey! Hand me the uh... uh... niner on top of my dresser.
by D.J. Camshaft October 27, 2011
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an erect nipple stimulated from sexual arousal, cold weather, etc. Thus, "niner" is a slang term for the combination of the words "nipping" and "boner."
It's so cold that I got an instant niner when I walked outside!
by kbl October 11, 2017
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a nine-inch penis, any abnormally large penis
She got stuffed with a plump niner
by Mrs. Jenkins July 14, 2008
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when a girl's thong is hanging out the back of her pants. Very common word in Woodbury, MN
by pullitup08 July 27, 2009
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A slang word used to refer to a policeman in a negative way. An undercover cop.
"Yo look out fellas, we got a niner on our tail!"
by Fetch Me My Coat September 21, 2006
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A reference to the Inland Empire region of Southern California, whose telephone area codes are 909 and 951.
"Oh, come off it - you live in Riverside!"
"Like you're any better, living in Chino."
"Shut up, you two - you both live in the niner."
by stephinextremis April 10, 2007
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No, nope
Comes from the german word for no (nine)
nine can also be used in the place of niner
At first was used mainly by scros, but now almost everyone uses it.

also
Scro 1: I heard she gave you a beeje after the lax game
Scro 2: Shob, Niner, i wish!

Person 1: hey do you have the latin homework?
Person 2: niner

Person 1: duuuuuuuuuude she is so HOT
Person 2: NIIIIIIIIIIIIIIINNNNNNNNNEEEEEEEE
by falalalalallaaaaaaaaaa April 21, 2011
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