When you want to call someone a mother fucker, but don't want to get in trouble.

Origin:
In Texas Hold'em, you can fold your hand and throw your cards into the "muck". Now imagine someone does that to a mom. Pretty messed up.
"Hey why do I not get a raise this year? I'm outta here you mother mucker"

"Oh this mother mucker just cut in front of me."
by Kevin Ju-ann May 16, 2021
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