A shemale or transsexual, discovered when getting to sexual second or third base, and more rarely, when attempting a straight home run.
Origin: Plays off of a baseball hit into foul territory, and the sexual "bases"
Person 1: "Did you get to third base last night?"
Person 2: "Nah mang, she turned out to be a foul ball!"
Person 1: "That's pretty foul!"
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