Generally someone whose actions would lead one to believe that the person is using crack cocaine due to the stupidity or messed-up-ness of their actions.
Used to describe something stupid, messed up or to express frustration with something
Man, you on crack! You will never get with that chick.
When someone doesn’t pull up there pant and there crack is showing you try not to stare. BUT when they are walking you see the crackcracking so you must stare.
Joe: “OOO the crack be cracking!”
Bob: “Yes that is one cracking crack!”
Joe: “HELL YEAH!”
They give each other high fives