"Lick on a trick for a Rolex" — meaning?

I heard this line in the rap song Ghetto Bird by Ice Cube (full lyrics here) and I'm completely puzzled by its meaning.

My homey's here to lick on a trick for a Rolex
And let me try the four next
Now the four I was driving was hotter than July
looked up and didn't see it whippin' in the sky
Saw a chopper with numbers on the bottom
"Calling all cars, I think we've got em."

I learned that lick can mean "easy money", and a trick can mean "a naive person", "a sex act with a prostitute", or "a robbery".

I could come up with several combinations of these meanings that would make sense on their own, but none of such combinations makes sense together with the following lines. Could somebody enlighten me what this line really means?

Rapgenius annotations:

lick on a trick for a Rolex rob a woman of her Rolex watch

ALSO

Now the four I was driving was hotter than july

annotated: Ice Cube’s 1964 Chevy Impala is wanted by the police

I agree with the rap genius annotations, though "trick" may not refer to a woman in these lyrics. While "trick" usually refers to a female prostitute, Ice Cube may be using it here in the same way that rappers refer to other men as "bitches". So my SAE translation...

My friend is here to rob this guy for his rolex.

A "four" is definitely a reference to a 64 chevy, the iconic old-school car for rappers.