brain fart

[ breyn fahrt ]
/ ˈbreɪn ˌfɑrt /

noun Slang: Usually Vulgar.

a brief mental lapse, especially an instance of forgetfulness or confusion: I had a brief brain fart and introduced him by the wrong name.

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Origin of brain fart

First recorded in 1985–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020