Synonym for messed up, fucked up, cocked up, etc. In other words, it's broken. Don't do like I did when I was a kid and get this confused with jacked off, which is an entirely different concept altogether. Rather than tell a fellow I would jack him up, I said I would jack him off, which got me several well deserved odd looks. Keep your lingo straight.

Also refers to a car customized with things like subwoofers, chrome wheels, and racing logos. Typical use of slang is a wannabe-ghetto kid going "Yo, we should jack that shit up" upon seeing a car they would enjoy customizing.

Can also refer to anything which is tweaked out like a "jacked up Athlon box with Geforce2" which would be overclocked like nobody's business, loaded with fans and prolly in a nice custom case to boot.

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