Top Definition
When you have sex with a pregnant girl
"dude, I got a dirty ryan from that knocked up girl at the party last night"
by lottsoflove October 24, 2009
When you get on top of your bitch and shit out a tiny bit to your turd is about halfway out your bumbcrack and you draw on her stomach using your turd as a crayon. A close cousin to the cleveland steamer.
"Hey dude....how was sex last night?"
"Man she loved it, no chick can resist the dirty ryan!"
by BigPoppaChump April 15, 2006

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