On 1 

to be drunk, or high, etc.

we gonna get on 1 today.

On 1 by melek May 3, 2008

In on 1 

To enter and post in a forum thread where the shit is about to hit the fan but hasnt yet. In order for it to be valid, you must post on the first page.

The shit can hit the fan for many reasons including but not limited to:
Clear drama about to begin
Troll exposed
Repost
Failure to use search

This started on Yellowbullet.com.

In on 1

In on 1 by Somewhatstock October 8, 2011

playing 5 on 1 

Jerking off. 5 fingers to 1 dick.

"I haven't had sex in a month so I've just been playing 5 on 1"

playing 5 on 1 by Marsellus April 6, 2016

1-on-1 

short for: personal discussion. means: 1 human talks to another human about private things like job, money or anything else.

yesterday i had an 1-on-1 with my boss, we talked about the work.

1-on-1 by checkbobby.com July 1, 2009

5-on-1 

Male masturbation (from 5 fingers and 1 dick)

I'm so horny, I think I'm gonna go play a little 5-on-1.

5-on-1 by Gordo December 28, 2004

5-on-1 

To perform the act of masturbation. 5 fingers Vs. 1 dick.

Now if you’ll excuse me, I’m going home to play a little 5-on-1.

5-on-1 by *_McQuiggins August 23, 2006

5 on 1 

to masturbate, to jerk off.

What are you doing? I'm playing some 5 on 1.

5 on 1 by nbnb January 6, 2008