Nick Young says he taught JaVale McGee everything he knows about the card game Bourre ... which might be a problem since it was THAT game that ignited the biggest gun standoff in NBA history.
Here's the deal ... Kevin Durant recently praised JaVale's Bourre card game skills during an interview with Bill Simmons.
So, when we saw Swaggy P -- one of JaVale's old Washington Wizards teammates -- we asked for his take.
That's when Young bragged that he taught JaVale the game back when J.