What does ISB mean?
I'm So Bored
Other definitions of ISB:
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I'm so bored.
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How to use the term ISB:
There are no example uses of ISB at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

SOAD
system of a down

ELE
Everybody Love Everybody

SFIPMP
so funny I peed my pants

BOF
Birds Of a Feather