My car starts itself, parks itself and auto-tunes
Cause now I'm in the Aston,

from Bad Meets Evil (Ft. Bruno Mars) – Lighters Lyrics on Rap Genius

Meaning

Apparently Royce now drives an Aston Martin

A reference to the line above — while T-Pain is known for using ‘AutoTune’, and didn’t want to work with Royce, now Royce has so much money that his car ‘auto-tunes’ itself (as in gets a tune up)

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