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".
Person #1: I got my car washed today.
Person #2: JCMB
a nicer way of saying shitballs.
"Oh shibbles, I missed the exit."
© 1999-2015 Urban Dictionary ®
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