Sean Kingston loves Mario Kart so much … the singer tattooed a giant freaking memorial to the video game on his arm … and the pics are kind of awesome. King posted the photos on Twitter the other day — showing his new suped-up Mario Kart inkjob in progress inside his L.A. home … courtesy of a local tattoo artist named Peter Koskela.We’re told the tat cost Sean a total of $1,250, and took 5 uncomfortable hours to complete. File it under things Sean will probably regret in 20 years. TMZ