What does MWM mean?
Married White Male ... Just letting you know your "undefined" is incorrect.
Other definitions of MWM:
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How to use the term MWM:
My husband is a MWM.
More slang terms:

BNNW
Brand New Never Worn

D&W
Ducking And Weaving

CES
Consumer Electronics Show

IWBNI
It Would Be Nice If