What does CAS mean?
Crack A Smile
Other definitions of CAS:
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How to use the term CAS:
There are no example uses of CAS at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

TSDMC
tears streaming down my cheeks

TNA
Temporarily Not Available

IHYRND
I Hope You Rot and Die

QL
Quit Laughing