Trey Songz just learned the hard way what it's like be completely DOMINATED on the basketball court -- thanks to a legendary street baller.
The R&B singer was playing in the Power 106 All-Star Celebrity Basketball Game in L.A. this weekend -- which raised money for a charity that rehabilitates former gang members.
But one body definitely hit the floor on the court -- when Songz (an avid basketball player) tried to guard Bone Collector ... one of the most famous street ballers in the country.
Collector went through his legs and spun him around so hard, Songz went bottoms up.
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