An impermeable barricade resulting from the entire black community congregating in a hallway
"I was late to 3rd period because there was a massive blackade in the middle of the hallway. SMH at those crazy niqqas!"
A blackade is a very large crowd of black girls and/or guys blocking a hallway in school or any other place. It can be very annoying at times when trying to get to somewhere in a hurry, especially when they start yelling at you for no other reason than getting knocked over by themselves.
Bob: Man, I really have to get to math class. O crap Its a blackade!
Black girl: AWWW HELL NAW