to crack an iPhone so it can run 3rd party programs. just like how you were able to install other programs w/PSP
noob: dude, u gotta update your iPhone, the new patch is awesome
guy: screw that, I'm waiting for someone to jailbreak the new patch so I can run my games
by inoesomestuff November 12, 2007
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In electronics: to enable use of a consumer electronics product not intended by the manufacturer through the exploitation of software hacks.

Commonly used to refer to enabling a carrier-locked phone, such as the iPhone, to accept SIM cards from other carriers. Or a restricted platform to run unlicensed or homebrew software.
"If you don't want to pay for AT&T on your iPhone, you can just jailbreak it."
by Ex Omni July 23, 2008
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the time immediately after leaving a long term relationship when you rediscover your freedom and have sex with as many people as you can
he only just broke up with her and already he's shagged 4 other girls

oh he's just on a jailbreak
by little acorn August 28, 2011
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To unlock a cell phone from its service provider so that it can be used with other SIM cards from different companies.
To unlock an iphone from AT&T and make it a free bird. Just shove in any GSM tri-band SIM card and you are good to go! thats what you call jailbreak
by S.H.R July 12, 2008
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Usually followed by an Escapee, which is a fart that escapes while pooping or peeing this usually happens when on the toilet or at the urinal station. It is a series of farts escaping making a machine-gun like noise, when a jailbreak happens, it is wise to just act as though it never happened, this will ease embarrasment on your part and on the part of others within earshot.
"Dude it was so funny, I was washing my hands at the sink in the bathroom at Madam X's porn shop and a guy had a jailbreak, I was laughing so hard I dropped my ten porno vid's I had just bought!"

-True Story
by Rice Hater July 11, 2005
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The rare and exciting occurrence when one or both of a woman's breasts pop out of the bra accidentally and are exposed for all to see.
Woah! Jailbreak! Nice titty.

or

Dude, did you catch that near jailbreak?
Yeah, I definitely saw a bit of a nipple.
by The Grazer July 14, 2008
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