1.One who is a complete moron, and idiot, a dumbass, or a bafoon. Practices bafoonary, idiocy.
2. Movie starring "pigeonkicker", a suburbs boy. "Crackass" portrays theemptiness of suburban life while still managing to run into stuff with shopping carts.
When the pudgy, slightly overweight, yet mildly cute waitress is helping the tablenext to you, bends over, her shirt rides up, and behold, 6 inches of ass-crack is staring you in the face.
Dude, did you just see that Arkansas Crackasaurus rear it's ugly head at the next table over?