Giving a rim job to an individual after said individual has experienced a bout of diarrhea.
Last night I gave my a girl a rusty rundown.
When someone shits in between a girls tits, and rubbs it around. The tity-fucks her.
Boy: "Its bee a while since i have gave someone a rusty hydraulic"
Girl: "Whats that?"
Boy: "Here lemmie show you, just take your shirt off...."
An anus that after a shoddy wipe is still covered in a thin smear of quick drying faecal matter.
Billy spent all day at work feeling rather self-conscious after his poorly executed morning evacuation had left him with a rusty plughole.
From the Adult Swim comedy "The Venture Brothers", it's when a guy jerks off so much his dick gets all red and sore.
Hooker: "I'm gonna give you a rusty venture"
Brock Sampson: "Don't believe the hype honey, a rusty venture is when you jerk off so much your dick gets all red and sore."
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The act of whacking someone in the eye with your penis after anally fornicating then kick them in the shin so they hobble around and squint like a pirate.
Dick gave Jane a Rusty Pirate after she told him how much she enjoyed Johnny Depp in Pirates of the Caribbean.
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