Brain Fart Definition

noun
A lapse in concentration, as when one loses one's train of thought.
American Heritage
The definition of a brain fart is a temporary failure to think clearly.
An example of a brain fart is to forget your address.
YourDictionary

(idiomatic, informal) Something ill-considered and said or done impulsively.

Wiktionary
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Other Word Forms of Brain Fart

Noun

Singular:
brain fart
Plural:
brain-farts

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brain fart