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.

Rusty submarine by bad lady planet October 25, 2010

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.

Rusty Submarine by GreatMcGoogler March 30, 2015

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"

rusty submarine by bak814 September 8, 2006