A bitch who likes to sleep around. She rarely cleans herself out, and the whole town knows what it's like to be inside her.
"Dude, I'm gonna fuck Morgan"
"Don't trip man... she's a dirty byrd"
by Cody Ayers July 28, 2006
After you are done having sex with a girl you spread open her vagina and/or butthole and take a crap inside of the vagina and/or butthole
"Dude, do you know Christine"
"Yea, why"
"I just did a dirty byrd in her cunt"
by Orea93 June 01, 2009

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