An extremely small penis, a contraction of "japanese penis," which are known to be extra tiny.
Girl 1: How did your date go last night?
Girl 2: It was great till we got back to his place. I wanted to hook up and I pulled off his pants to see that he had a japenis...I was totally disappointed and I left.
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A bet that pays off big or just something that is awesome. Comes from the racetrack, where a winning bet on a big ticket pays so many zeros that it looks like the dots on double sixes ("boxcars" in dice). Can be used in combination with ship it.
Man, I hit that moneyline parlay and it paid boxcars.
Dude, did you see that girl's ass? It was boxcars.
Guy 1: We just scored an 8th and it's nuggy.
Guy 2: Boxcars.
Guy 1: That slampig wants to f you later
Guy 2: Boxcars, ship it.
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Used to describe your reaction to something shitty. Is the antonym of ship it.
Guy 1: Hey man, I just found out that the girl you screwed last night raw has the clap.
Guy 2: Oooh...send it
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An older woman who loves to fuck. It's the older version of a slampig.
Dude - I was at the Delano last weekend and man there were so many slamhens trolling for dick!
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