brain fart
colloquial A momentary mental lapse in attention, memory, understanding, care, or competence. Sorry boss, I just had a little brain fart there. What were you saying again? Jack, having a bit of a brain fart, accidentally sawed the beam completely in two. A: "You hit the mailbox? But you've backed out of our driveway a million times!" B: "I know, I must have had a brain fart or something."
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