Ja Morant just ensured he'll take the Mamba Mentality wherever he goes forever now ... 'cause the NBA superstar just got a massive new back tattoo, featuring two Kobe Bryant tributes.
The Memphis Grizzlies point guard hit up Andres Ortega and his Onder Ink team to get the new tats ... and on Saturday, the artist flew to Miami to put the work down.
Ortega tells TMZ Sports ... Morant sat for 10 hours total -- while he and his team placed artwork all over the basketball player's back and torso.
The pieces came out great ... and there's now nods to the 23-year-old's life and hoops career all over his body.
On his back, Morant got the logos of his high school, college and NBA teams ... as well as his Nike logo and his jersey No. 12. He also got four aces, some dice, and the words "Life's a gamble."
In the Kobe portion of the ink, he got the Lakers legend's famous logo -- as well as his old No. 24 jersey number.
On his chest and stomach, Morant got his birth year, an eye, some doves, some crosses and a 100 emoji.
Ortega says Morant was chill and cool throughout the whole process ... and afterward, Morant was so thrilled with the pieces -- he signed some autographs while flashing a huge grin.