So there is a rap song about chevy or something and its stuck in my head i dont know what calledhelp please?

The rap song you are thinking of could possibly be "Ridin' Around in My Chevy" by DJ Paul and Juicy J. The lyrics mention riding in a Chevrolet Monte Carlo. Here is a portion of the chorus:

Ridin' round, ridin' round, ridin' round town in my Chevy

Throwin' switches down Main Street, got them haters feelin' heavy

We don't care, we just be ballin', and we ridin' real crazy

In my Chev-a-roo, cruisin' with no roofy