Blue Jays catcher Reese McGuire was epically trolled by the Atlanta Braves team organist mid-game Thursday ... and the scene was laugh out loud funny!!

McGuire -- playing in his first game since TMZ Sports posted video of his SUPER awkward masturbation bust -- was walking up to the plate in the 3rd inning when he was greeted by "Beat It" over the Atlanta loudspeakers.

The Michael Jackson tune played for several seconds ... and if you get the reference -- try not to smile!!

Of course, McGuire was stopped by cops in a parking lot last February after witnesses say they saw him inside of his car pleasuring himself.

In police footage of the incident ... McGuire apologized profusely for his actions, saying, "I've realized that I made a mistake having my pants down and doing what I was doing."

He added, "I really am apologetic. And, I know I shouldn't have been doing this."

McGuire eventually was forced to pay fines and fees over it all after cutting a deal with prosecutors ... but clearly, MLB teams ain't going to let him off that easy.

To make matters worse for McGuire ... he finished the night 0-for-3 with two strikeouts after the troll job -- AND the Jays lost in heartbreaking walk-off fashion.