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 23, 2006
Get the The Rusty Truck mug.
A dildo pulled out of someone’s anus covered in feces
It’s starting to smell in here get rid of that rusty truck
by Mc fed September 30, 2021
Get the Rusty truck mug.
The act of making a home made flamethrower and then having sex with a girl. When you are at the climax, you pull out and set the girls lower area on fire. This can also be done with water
Last night, I gave your mom a rusty truck
by sonicwake May 11, 2010
Get the Rusty Truck mug.
a girl one might fuck for purely utilitarian reasons. i.e. fat and nasty, but willing.
Scott rationalized sleeping with that Rusty Dump Truck the other night because let's face it, it was late and he hadn't been laid in like a year. There was also Jägermeister involved.
by lostaccident August 24, 2006
Get the rusty dump truck mug.
a girl who is very large and busted

"that girl is a rusty dump truck"
by Echoli June 29, 2006
Get the rusty dump truck mug.