100% discount

To get a 100% discount on an item is to steal it, this giving you 100% off list price. Applies both to physically stealing and to media piracy.

I got the 100% discount on this new phone

I can't afford this game, so I got the 100% discount on it.

100% off discount coupon

A weapon, often a gun.

Me showing the shopkeeper my 100% off discount coupon