Shaquille O'Neal's turning 50 this weekend, but he ain't slowing down ... in fact, the NBA legend's literally getting faster after getting a brand new, customized Dodge Charger Hellcat for his big day.
The NBA Hall of Famer -- who's turning the big 50 on March 6 -- showed off his new whip on Friday ... saying it's the "best birthday ever"!
The car looks awesome ... with it's custom silver and red paint job and scissor doors (like on a Lamborghini). It also the words "Diesel Dog Mafia" painted on the hood.