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When you pull your pants all the way up, so as to hide your underwear specifically to avoid judgement or assumptions from society or law enforcement
the mundies are showing bruh, better hide that
you don't put the mundies away they gonna judge
mundies by ianofaustin October 19, 2020
Related Words

headbutting me undies 

Australian term. To be on the point of shitting yourself or needing a shit very badly.
Nick: "I nearly shit myself yesterday....it was headbutting me undies"
headbutting me undies by fuelline February 14, 2018