Top Definition
Acronym for Chuckling Beyond All Control. A more refined version of LMAO or ROTFLOL! It's doubtful that anyone has read something online that was so hysterical that they actually ended up on the floor, rolling around and laughing.
OMG, CBAC! I swear I almost spit my soda on the keyboard. That's HYSTERICAL!
by whyme1982 November 14, 2010

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