It basicaly is cool, but the begining letter is the letter before it in the alphebetical order. Instead of c, its b. Much like drunk, and crunk. It is very much the same. The Bloods most definitely didn't start it.
I played this bool game last night, when i was crunk and had a hard-on.
To bool, is to destroy (wreck) someone in a Video Game. The Video Game where the term "Bool" originated is PlayerUnkown'sBattleGrounds aka PUBG. Can be also used as, Booled and Booling
Shanaenae: Dude we're booling these people.
Maui: Yeah, bro. We booled these people.