Top Definition
Abbreviation, and an understated way of saying "Jesus Christ Monkey Balls". A phrase made popular by South Park.
Could be used much the same way as "omg" or "omfg".

Chatroom example:
Person #1: I got my car washed today.
Person #2: JCMB
#jesus christ monkey balls #omg #omfg #omfug #chat #internet #aim
by mwolfrose February 25, 2009
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