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Originally an American term originating from jameslikecoulter in Los Angeles meaning to "jack-off". Recently the term has been shipped over to Britain and is a growing British term.
"Hey, Hannah smiled at me today."

"Woah, get in there!"

"Nope, turns out I woke up to a penis drawn on my sharpie. Hit the JO instead."
by Shill November 07, 2012