The act of publicly masturbating while on a street corner in San Diego, usually after having led a social justice campaign, and gone nuts from the pressure. The term was coined by South Park which satirized the founder of Invisible Children, Jason Russell, for engaging in the aforementioned act, which pretty much destroyed any momentum his movment, Kony 2012, had left.
Kyle: "Well when you're naked and jacking it in San Diego, don't say I didn't warn you."

Stan: "What?!"...

Barber shop trio: "Jackin' it, jackin' it, jack-ity jack, spankin' it, slappin' it, spank-ity slap!"...

Mayor: "...why not try jacking it on one of our city streets? San Diego, cum, take a load off."
by MAV28 March 12, 2013
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