A hefty fine is surely coming Kelly Oubre Jr.'s way -- the Philadelphia 76ers hooper absolutely unloaded on referees over a blown call at the end of Wednesday's game ... appearing to call them a bunch of bitches.
The Sixers' 108-107 loss to the LA Clippers ended in controversy ... when KO drove the lane in hopes of getting the lead in the final seconds of the contest, but made contact with Paul George instead.
Oubre and Sixers coach Nick Nurse were both LIVID over the non-call after the buzzer .