brainfart

/B R EY1 N F AA0 R T/
noun
  1. 1

    Something ill-considered and said or done impulsively.

  2. 2

    An instance of absent-mindedness or forgetfulness.

    โ€œSorry for the brain fart, but what exactly did you say again?โ€

Source: https://en.wiktionary.org/wiki/brain%20fart, https://en.wiktionary.org/wiki/brainfart