It was like a head on collision that folded me standing still
The cops' sudden decision to harass Kendrick felt like this:
They ran right into him and now he’s in trouble. This could also be a metaphor. Him saying he’s in the middle of a head on collision, 1 car being the gangs he’s surrounded by and the other being the police of Compton that are quick to assume things.
The line can also be depicted as the physical action of literally being thrown into and folded meaning bent over onto the hood of the squad car as the cops cuff, search and detain him.
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