A psycho's way of saying "Sweet!" when they are too excited about something crazy...
Jay: Did you see that guy with his hair on fire running around yelling "my hair is on fire, my hair is on fire?"
John: Dude, you just set that guys hair on fire!
Jay: Oh... yea. That was Swee!
SweeBlaDook is derived from the words Sweet Black Dooky, or what is known as the fecal matter that emanates from the buttocks of a beautiful young black female.
"Girl, the seat of your jeans smells like Swee Bla Dook, an' that's my favorite smell an' shit, know what I'm sayin' "?