Acronym for Fielder Allows Runner To Score Like A Moron.
An baseball play in which a defensive fielder makes an embarrassing combined mental and physical blunder that allows one or more base runners to score. A simple error alone does not qualify - there is an added layer of moronity on top of the play, where the player involved has
momentarily stopped
playing baseball.
Examples include arguing with an umpire while holding the ball and not paying attention to the runner, missing a catch and then angrily throwing your glove
on the ground and stomping away, or catching a pop fly for the second out, but thinking that it's the third out and casually throwing the live ball into the stands.
Benny Agbayani
committed a FARTSLAM when he caught a fly ball, and
thinking there were three outs, gave the ball to a fan, which allowed
the runner to score, and Agbayani had to ask for the ball back.