- The 'fart' metaphorically compares the sudden out-of-nowhere quality of farts with the sudden eureka-like moment of the brilliant idea. The brain does not really fart, it just creates an unexpected burst of an creative idea. Usually is said right after the fact to denote surprise from the thinker of his sudden good idea.
Brainfart (2)
noun; compounding
Sudden brilliant idea when the thinker is having trouble concentrating
Etymology : compounding of 'brain' and 'fart'
Source : "Wow, I just had a brainfart!" High School teacher, Pharr, Texas, 2006
Last modified: 5 December 2008