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
J.O. is also a term used to describe one who was once Amish then "jerks over" to the ways of the "normal white man"
J.O.s typically drive old American muscle cars to compensate for their years of seperation from all things modern.
J.O., also known as "masturbating, wanking, tickle the pickle, etc." is a short abbreviation of the word "Jack(ing) Off". This short and simple way of communicating sexual pleasure mainly for men will save a lot of time with conversation. When in public, this term can even be subtle to others when in a conversation.