Hiblack is a mixture of the word Hijack (like steal) and the word Black (like afro-american). Hiblack is used when some black dude gets robbed or some black dude rob someone. Or if some black guy rob another black guy.
"Oh My God, I can't believe you hiblacked me!"
"Did you see that? He just got hiblacked!"
"Damn you hiblackers!"