Used to politely tell someone that they just completely contradicted themselves. It can also be "Read that again, but slowly" if it's in text rather than actually being uttered.
Dumbass: "The Flat Earth Society has members all around the globe!"

Normal Person: "Say that again, but slowly..."
by Someone who kinda exists September 23, 2021
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A fucking loser who eats Cheerios while thinks furries are apart of the Bible. L
Person 1“OH MY GOD ITS THAT GUY SAY “WHAT” AGAIN EWWWW

Person 2 “IKR WHAT A FUCKING LOSER LIKE LOL”
by ItsODRJR May 30, 2019
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It's a kind of term when you agree with someone, he/she. It shows that you are in one thought with that person.
Ex: (Mom yelling at us to be quick)

Sister: "Mom is soooooo IRRITATING!"

Me: "You can say that again" (showing that you agree with your sister (do you?))
by seetheworld October 15, 2018
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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.
by K.S28 March 27, 2018
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