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"Say Something" is a peice of speech used in thoes motherfucking adverts hosted on almost every media-based websites.

The adverts are advertising some stupid website to get you to download their smiling shit.
Smiley: "Say Something"
Robot: "What?"
by Nitrogen March 06, 2006
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provoking another person to retaliate or come back to something you just said, because you are so confident you are right that you know they can't come back with anything.
and you know that's why you lied about having chlamydia! you know i'm right! say something!
by Angelacia June 21, 2011
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