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

ASLO
age sex location orientation

IDHI
I don't have it

MBUC
Mind Bogglingly Unlikely Coincidence

TLDR
Too long, didn't read