What does PBM mean?
Play By Mail
Other definitions of PBM:
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How to use the term PBM:
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More slang terms:

Blue Waffle
Refers to an particular image of a diseased vagina that has been spread online. It is meant to be vague, and therefore searched for, leading to viewing.

SAIA
Stupid Asses In Action

GIWISI
Gee, I wish I said it

BRS
Big Red Switch