It's the sexual version of the Funky Chicken. Once performed for small audiences of Amish at the neighborhood barnyard theater, we have Ed from Sparta, NJ to thank for showing us what happens to our egg-laying friends after one turn too many.
"Man, did you see the feathers fall out of that one during the last push."
"Does she have a sister?"
"Nah, but she has a cock....for a brotha."