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RAB is another of the seemingly endless array of chat acronyms including LOL, ROTFL, LMAO, ROTFLMAO, WTF, OTOH, IMHO, YMMV, AFAIK, etc.
It stands for Raises A Brow.
I believe that it is more common in online Role Playing comunities than in more general chat fourms.

Rab (rab), n.

A rod or stick used by masons in mixing hair with mortar.


© Webster 1913

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