The onomatopoeia of a ray gun's rays. It is usually heard after the phrase "Oh no look out it's a ray gun!" Those hearing it must take caution.
Person: Oh no look out it's a ray gun!

Pyew pyew!

Bystander: Oh dear! (dies of ray gun wounds)

Person: The rays were coming out of the gun! You should have avoid the rays!
by Angsty_Amoeba October 15, 2008
Get the pyew pyew mug.