While having sex when your girlfriend is on her period, let your dick get blood on it. Then you pull out and let it dry, allowing the "rust" to form. Then bend her over, get a good 10 ft. running start, and straight up truck her ass.
The Rusty Truck:

Male usage: "Betty's been bitching all week, and I got so annoyed, I pulled out the big guns and Rusty Trucked that bitch."

Female usage: "I met this guy last night at an S&M convention. He was really cool. I was on my period and I still have bruises on my ass from all those Rusty Trucks."
by Taylor, Matt, and Blake June 22, 2006

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