What do you get the man who has everything? Nicki Minaj figured it out ... getting Lil Wayne one of the craziest awesome gifts ever for his 30th birthday ... a tiny 3-wheeled $70,000 sports car called a T-REX.
Sources close to Nicki tell TMZ, the new "American Idol" judge got Weezy a Campagna T-Rex 14R -- a two-seater motorcycle-car hybrid that's ultra-lightweight at 1,040 pounds ... and FAST, reaching speeds of 150mph.
The trike retails for roughly $50,000 but we're told Nicki tricked hers out as a special "thank you" for all Wayne's done for her career -- dropping a total of $70,000 on Weezy's gift.
We're told the car-thing was delivered to Wayne at his giant 30th birthday bash in Hollywood last night -- and the rapper was stoked about the present.