Saturday (Oooh Oooh!) Word of Mouf Ludacris

how you gonna act like I don't push 'lacs

to "push" means to drive, possibly from the fact that when you drive a car you are making it travel forward as if pushed. so, he is wondering why you doubt he drives expensive cadillacs (maybe because you're jealous).
bill
5
The artist is telling us that his Cadillac is broken, and must be pushed. He has probably run out of gas, or is having mechanical problems.
pete838
2.5