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

GYT
Get Yourself Tested

2D4
TO DIE FOR

IAP
I Am Pissed

AFWIW
Anyway, for what it's worth