When you shit in someones mouth, then receive a blowjob from that person.
"Man, she sure gives a mean rusty train."
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When Snoop Dog and Dr. Dre roll up your bitch and your girl eats Snoop's ass while Snoop gives Dre a rusty trombone.
"Ay yo Snoop want to go run a Rusty Train G Thang on that guys bitch"
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