j/o 

Jack Off; masturbate

We had a mutual j/o last night.

j/o by Billy Jean Cox April 18, 2003

j/o 

Synonymous with "stupid".

monkeyboy: omg i liek teh j/o!

j/o by Zorui June 11, 2006

J/O 

A term used to describe 'jerking-off' or 'jacking-off' - otherwise known as masturbation, or self-pleasure activities leading to orgasm and ejaculation of semen.

Used by Polecat324 when approaching minors asking for pictures of their 'sexy bodie'.

"send some photos right now plz I'm trying to j/o"

J/O by Polecat699 September 18, 2022

J.O. 

To jerk off

You going out tonight?

Nah Imma stay home and J.O. To some gay porn

J.O. by Ginger Snappah Head October 5, 2021

j o 

Jack off, or Jerk off J O or JO

What a J O!
That guy was a J O.
Your being a J O.

j o by Gerret January 9, 2008

J-O

Or J-Oing, an abreviated term for the noun: Jack Off. Or Jacking Off. The act of masterbating. Made popular by lazy idiots and people who are shy about such topics in public.

Dude, were you J-Oing in my bathroom?

J-O by davethelightguy May 31, 2007

J.O. 

jerking off, beating the meat, slapping the foot long.
VARIATION: circle jerk (for desperate measures only)
Come on, if you don't know what JO is, then you're a girl, a homo, or you don't have a penis

Yo dude you gotta go home or go in the other room or sumthin i gotta JO.

J.O. by tony February 10, 2003