Top definition
An actual challenge, not a prank, to see how long one can withstand swishing a full shot (the cup attached on the bottle) of Listerine - *Cool Mint* inside their mouth.

This is usually very difficult to do for most people, given the fact that the formula for most Listerine products gives a burning sensation that damages the sensitive tissue inside your mouth.

But on the plus side, the victim of the Listerine Challenge gets a cleaner, fresher, mouth.

**this is in no way promoting the products of Listerine, or any dentists.

See also: cinnamon challenge
Friend 1: "Hey, you want to try the Listerine Challenge?"

Friend 2: "Okay, what do I do?"

Friend 1: "Swish this small cup full of Listerine - Cool Mint, in your mouth for 30 seconds, and you'll get 10$ dollars."

Friend 2: "Challenge accepted."

10 seconds later...

Friend 2: "Fuuuuuuuuuuu!!1!!"
by Poop The Human August 27, 2012
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