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

HAR
Hit And Run

SYIAB
see you in a bit

USBCA
Until something better comes along

NPGF
no problem girl friend