big niner

A synonym for penis or a nickname for someone with the initials B. N..

Wow that is a big big niner.

by lil'niner June 5, 2016

Seventy Niner

A person who is mentally challenged and their IQ is borderline mentally. Where they seem normal but cannot go deeper into a subject.

This guy seemed normal, but after trying to dig deeper into the subject I realized he was a Seventy Niner.

by Seventy Niner February 2, 2026

oon-deuce-niner

also known as a big gulp slurpee

Customer "how much is this slurpee?"
Chailott "brotha, it be a oon-deuce niner"

by g-birdman March 28, 2003