"cock used to mean pussy" is one of those things that sounds made up but is absolutely true
"Cock" is short for "cockle", which is a reference to the vulva in several different languages. This usage is documented in several toasts (one about "a rubber cock that can take any size of prick"), old blues songs, and even in some older rap. I didn't know this until I read Elijah Wald's book on the dozens
The book is called Talkin Bout Your Mama and has also been printed with the title Rap's Mama. Highly recommended































