Another way for saying Damn!, Wow!, Unbelievable, or That's crazy!
First used in this context in the summer of 1996
You and your friend are walking down the street when a good looking girl passes you. You look to one another and say: Deezy!
When something is really jacked up like someone's messed up grill, you say: Deezy!
If you see a nice ride pass you by (like a tricked out Bimmer, Benz, or Bentley), you say: Deezy!