dumbshit en · ADJ
Etymology
From dumb + shit.
Meanings
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(colloquial, derogatory, not-comparable, offensive, vulgar) (of a person) Stupid, or prone to making mistakes.
"If you know me, perhaps you can tell me why I'm calling you?" "Would I be dumbshit enough to tell you? ...
1962, Isaac Asimov, editor, The Hugo winners: volumes 1-2, page 626: