Then they chase, catch me if you can, I ain't Dicaprio

from Mac Miller (Ft. Sir Michael Rocks) – Aliens Fighting Robots Lyrics on Rap Genius

Meaning

This line refers to the Leonardo DiCaprio movie, Catch Me If You Can.
Mac is saying that it’s possible to catch him, but you need to be skilled enough to be able to.

He’s not the one running away (Dicaprio’s character is)

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