NBA star Nick Young -- aka Swaggy P -- was arrested in Hollywood late Friday night after an incident during a traffic stop with police ... TMZ Sports has learned.
Law enforcement sources tell us ... the Golden State Warriors star was pulled over just before midnight for a routine traffic violation when something went wrong.
We're told 33-year-old to cooperate with the officers on scene and so he was arrested for obstruction of justice.
One witness tells us ... cops took Young out of his vehicle and ordered him up against a wall where he was handcuffed and taken into custody.