Definition 1: to get shot.
Definition 2: To get fucked up.
Definition 3: To kill someone.
Gangsta: "Damn homie, I was rollin' through Crip turf an' I damn near got blucked!"
G 1: "Muthafucka I'ma fuck you up!"
G 2: "Bitch bring it, yo' ass is about to get BLUCKED!"
Homie 1: "Ayo, I jus' saw that bitch you beefin' with stroll by..."
Homie 2: "Oh fa sheezy? Lemme get my strap, I'ma BLUCK this muthafucka!"
2.) S/he blucks so hard I came out of it with a blood-blister on my <insert appropriate genitalia here>