The phrase "playing my Nintendo" means that someone is "playing with another's heart." This is a gay term, however, and typically used as a discreet way to refer to a bond between two homies.
"James has really been playing Luke's Nintendo lately. Luke should just ask him out already."
alt:

"Damn, Arcangelo, playing my Nintendo."
by Cecil is better than you December 19, 2018
Get the Playing my Nintendo mug.