Backdoor Slider
A pitch that breaks over the plate
Example
did you see that backdoor slider in the last inning?
yeah, that was such a nasty pitch!
Backdoor slider definition by Slang.net - The Slang Dictionary
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Baseball Slang Quiz: Can you bat 1.000?
A backdoor slider is a crafty pitch in baseball that slides across the plate, appearing to be heading out of the strike zone, only to break sharply back over the edge before getting to the catcher. You will likely hear announcers, coaches, players, and fans use the term in broadcasts, online, or in real-life conversations.
Pitchers typically unleash a backdoor slider when they're ahead in the count, aiming to surprise the batter and get a strike (or strikeout) without a swing. Because it deviates from the straight path, this pitch is a way for the pitcher to play mind games with the batter, influencing them to swing at pitches outside of the strike zone.