brain fart

plural brain farts · alternative brainfart · alternative brain-fart

1. mildlyslangvulgarSomething ill-considered and said or done impulsively.

   This is love in the social media age. Candlelight dinner, fine wine, degustation, a lover's face scrunched over a phone screen live-tweeting brainfarts about the relationship to largely uninterested skim-readers.

   2011 July 8, Grace Dent, The Guardian

2. mildlyslangvulgarAn instance of absent-mindedness or forgetfulness.

   Sorry for the brain fart, but what exactly did you say again?

   1 more example

   Shadow turned off the heaters, packed some clothes into an overnight bag, then turned back to Wednesday and said, ‘Look, I feel kind of stupid. I know you just told me who we're going to see, but I dunno. I just had a brain-fart or something. It’s gone. Who is it again?’

   2001, Neil Gaiman, American Gods, William Morrow, →ISBN, page 276