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an abbreviation of the phrase "just chillin, you?" in which scums, often a male, use in order to type faster to each girl they talk to.
scumbag: "hey"
girl 1: "hey whats up? :)"
scumbag: "jcu"
girl 1"samee."

scumbag: hey
girl 2: hiiii. what are you up too?
scumbag: jcu
by market pantry February 28, 2011
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