Niner is a versatile word that can basically mean any word that you didn't feel like trying to think of at the moment. It can also be an exclamation, an insult, or a substitute for a name. Alternate spelling: 9er
"Hey 9er what's up?"
"Hey look at that 9er over there!"
"Could you hand me that niner?"
"Cripes you're such a niner."
"Studies show that these 9ers (point to something) have significant migration during the winter."