LaMarcus Aldridge just got a new massive back tattoo featuring an image of the Joker ... and check it out -- it's so seriously awesome!!!
The former NBA star hit up Andres Ortega and his Onder Ink team last month to get the piece done ... and after sitting under the needle for 10 hours, most of the backside of the hooper's 6'11" frame was completely covered in ink.
INTENSE INK
On the bottom of the tattoo, Aldridge got Batman's nemesis tatted because, according to Ortega, the former San Antonio Spurs forward said there was a time in his life when nobody believed in him -- and this was his way of laughing at those detractors.