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To successfully have sexual intercourse with your own sister.
Billy hit an inside the park home run last night, and now his mother is mortified.
by McCock, the Crime Dick August 8, 2007
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inside-the-park home run

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The baseball themed innuendo equivalent to rape.
Bro #1: "Dude I totally ended last night with an Inside-the-park Home run."
Bro #2: "Isn't that illegal?"
Bro #1: "Not when the catcher's drunk!"
Bro #2: "Chyeah, brah!"
by heyguyzzz January 27, 2011
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Inside-the-park home run

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Doing a #2 in a public urinal.
From American Dad, season 12, episode 20, "Gift Me Liberty":
Stan: "I know you're hiding sonething!"
Dick: "(Sobs.) OK! OK! I'm the one taking dumps in the urinals. I call them 'inside-the-park home run'."
by Kefteniglo February 14, 2017
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