Meyers Leonard is in some seriously hot water -- the Miami Heat center appeared to use an anti-Semitic slur during a recent video game stream this week ... and it was all captured on video.
The 29-year-old was playing "Call Of Duty: Warzone" on his Twitch channel -- which has nearly 70,000 followers -- when he seemingly says the following: "F***ing cowards, don't f***ing snipe me, you f***ing k*** bitch."
Yeah ... it's bad.
The comment was met with awkward laughter by other gamers on the stream ... but Leonard seemed to brush off the situation and kept playing.