Rusty Submarine

When a girl pulls her pants down (her cheeks loomin' over yo' erect dick), pops a squat, and straight up takes a massive, gravy shit on the tip of your penis. Like, not even in a sexual way. She just has to poop.
Ted: "You remember that machine Wonka drove down the chocolate river?"
Bill: "The boat?"
Ted: "Yeah. I was trying to remember why I was thinking of that boat, and then I realized.. it looked just like Paul's dick after Becky gave him that rusty submarine this morning.
by GreatMcGoogler March 28, 2015
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Rusty submarine

The act of having intercourse with a woman during her period, wherein the man (or the person with the dildo) penetrates her vaginally, creating the "rust," and then penetrates her anally, sinking it in a deep dark place.
My cousin had her period, so I totally rusty submarined her.
by bad lady planet October 24, 2010
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rusty submarine

Its when u fuck a girl in the ass and your dick is coverd in shit and you make the girl give you head.
"hey tyler i gave that girl ashley a rusty submarine last night"
by bak814 September 08, 2006
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