What does H9 mean?
Husband in Room
Other definitions of H9:
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How to use the term H9:
There are no example uses of H9 at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

BTHU
Back the heck up

IAWTC
I agree with this comment

AZZ
a**

LPIAW
Large Penis is always welcome