dirty niner

Two partners perform 69 and just as you are about to cum you let out a fart.

Me and my girl were doin 69 the other day and I activated the dirty niner so she knows it's real.

by Sherwood Forest December 9, 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