when a challenging situation is presented, the phrase is used to provoke a person to attempt the challenge. Also used to taunt or encourage to fail.

Origin: Said when opposing team shoots a 3 point shot at high school basketball games.
person 1: What if i shot a firework at my moms car?

person 2: Dude, heard you wouldn't

(Can also be used in different cases such as: heard you couldn't, heard he wouldn't, etc...)
by Mer-Sal Pals January 03, 2013

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