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English word dumbassery comes from English dumb-ass ((vulgar).), English -ery
dumb-ass (English)
(vulgar).
-ery (English)
Art, craft or practice. Characteristic of. Class or group, collection of. Organisation or movement. Place of art, craft or practice.
dumbassery (English)
(slang, vulgar) Immature, foolish behavior; behavior typical of a dumbass.