UPDATE: there are many forms of juju, some of which being "le juju" pronounced shoo-shoo, the infamous "zoey 101" juju and who can forget the wuju, a wanna-be juju done by a rookie.
person 2: *JUJU*
person 1: 0_0 woaaah!!
2. An aura or other magical property, usually having to do with spirits or luck. Can be used in place of 'luck' or 'karma'.
2. 'Don't cheat on the exam, it will bring you bad juju.'
I'm not surprised I broke my arm; I've still got some bad ju-ju from that time I hacked xyz.com.