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.
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.
The act of having sex with two women. The man performs anal sex on the first woman until covered then puts his penis in the second woman's vagina. Bonus is the second woman is a MILF
Bobby was having sex with two women. Sara enjoyed anal, Stacy did not. Once Bobby was done having anal sex with Sara he proceeded to bang the shit "into"Stacy, performing the act of Rusty Suburban