NBA Rookie of the Year? Nah, Ja Morant is flat-out SON of the Year ... 'cause the Memphis Grizzlies superstar just surprised his dad with a brand new car -- and it's awesome!!
The 20-year-old posted vid of his new present for Pops on Wednesday ... and check out Dad's reaction -- dude couldn't even stand up straight he was so blown away!!
As for why ... the ride is pretty amazing -- it's a new Dodge Charger SRT Hellcat, which goes 0 to 60 in about 3.6 seconds!!!
The ride -- which can come with up to 700 horsepower in the engine bay -- cost right around $70,000 with all the bells and whistles .