What does I got your back in these mean streets mean?
it means someone will always be be your side no matter if anything good or bad happens it will be a supportive someone
"I got your back" means "I am behind you" or "I will defend you" -- "these mean streets" mean "this location, which is hard and tough to survive."
I've got your 6 would mean I'm covering your back, I'm on your 6 would mean I'm right behind you. It refers to directions as the hours on a clock. 12 would be forward, 3 would be right. 6 back and 9 left. It's also what a fighter pilot says to another to say they got your back, so the other fighter pilot knows he's safe when his friend says "I've got your six"