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

ROTFLMFHO
rolling on the floor laughing my f**king head off

LOL2U
Laugh out loud to you

TBE
To Be Expected

YAAG
You Are A Genius