Phrase used at the end of someone's obnoxiously horrible story by everyone who heard it, in response to its pure stupidity. Almost always accompanied by claps and said in a chant, so it becomes:
"Grrreeaaaaat Story....Tell itttttt again!" (With one clap for each word)
Person 1: So yesterday I went to go get coffee, and it sounded really delicious, but the coffee shop was closed when I got there.
*Pause*
Everyone listening: "Great Story Tell it again" (chant)
a Fiat brand automobile (a backronym stemming from the lack of reliability and other problems ecountered in the vehicles by U.S. owners durning the 1970's-80's)
When someone preaches some truths, you use this phrase (usually in comment sections online) as a way of agreeing.
For instance on Facebook you may have:
Person A: "You should never blame a whole group of people for the actions of a few people within that group!"
Person B: Say It Again Louder For The People In The Back.
"So like, I was at the store, and like the guy was all 'So you want paper or plastic' and I was like 'plastic' and like I baught a pack of gum but OMG he's soo hott..."