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Jackin it - The slang term for masturbate

mas·tur·bate
-bat·ed, -bat·ing.
–verb (used without object)
1. to engage in masturbation.
–verb (used with object)
2. to practice masturbation upon.
Origin: 1855–60; < L masturb&#257;tus, ptp. of masturb&#257;r&#299; to engage in masturbation

—Related forms
mas·tur·ba·tor, noun
Dictionary.com Unabridged (v 1.1)
You: Where is Nick?
Me: Oh, he is at his house jackin it to some porn.
jackin it by SpERRM November 26, 2007
Too pleasure one's self in a sexual way
T: dude i was jackin it major last night!
Jackin It by Martyn Mcfly December 24, 2007
The action of a chad stroking his enormous chodester. Pog
Brendon was jackin it.

Jackin' It In San Diego 

yes.

basically masturbating in San Diego of California
most people do this after getting into drama that is SERIOUS
but seriously this is a song for south park made by Trey Parker, Matt Stone, and Bruce Howell.
Stan: I just have to put an end to bullying Kyle! You don't get it!
Kyle: Yea but you are profiting off of this for yourself only! Just don't end up naked and Jackin' it in San Diego.

Jacking it in San Diego

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."

Matt Jacking it 

when someone constantly kills the joke or uses it ALL the time
person #1: hey, did you hear about the skeleton that went to the party?

Matt Jacker: yeah, he had no-body to go with

-later-

Matt Jacker: hey, did you hear about the skeleton that went to the party?

Person #3: yeah, he had-

Matt Jacker: no-body to go with!

Person #3: stop Matt Jacking it! dick
Matt Jacking it by Roo Barb June 19, 2008