mub
A person who is acting like a bum for a brief moment, usually by being lazy, clueless, or unusually dumb, even though they are not normally like that. It is “bum” backwards because the behavior is temporary and out of character.
Matilda spent five minutes looking for her phone while it was in her pocket. She was being a total mub.
mub by ThatSpring June 12, 2026
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