"I Say, You Say Louder" is a game.

The objective of the game is to be the one that yells the picked word or phrase the loudest. The first person whispers, then the next person whispers louder, and the next person says it, until it progresses into an intense screaming match.

Phrases often used for this game are "unicorns", "I do believe in fairies", and "penis."

This game is well demonstrated in the movie "(500) Days of Summer", where a couple is playing the game while using the phrase "penis."
Two people in a game of "I Say, You Say Louder."

1st person: *Whispers,* "Unicorns."
2nd person: *says*, "Unicorns."
1st person: *says louder*, "Unicorns."
.....
2nd person: *screams*, "UNICORNS!!"
by Schmandrea December 31, 2010
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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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Words don't mean a thing until you show actions towards what you're meaning. You could tell your gf/bf that you love them 100x but it won't mean anything until you show it.
Bf:I love you

Gf: I love you too but you don't show it..
Gf: actions speak louder than words
by Loverxsea June 9, 2018
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