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

IITYWIMIWHTKY
If I Tell You What It Means I Will Have to Kill You

STFUPPERCUT
shut the f**k up

FURTB
Full Up Ready To Burst

DAII
day