Paynuss is the latin root word for the commonly used word penis, meaning male genetalia. It is believed that the origin of the word came from a man with the name "Nuss". Nuss was a latin man that was said to have a 30 foot monster. Because of this beast, the leadies flocked to him, and they had to "pay" Nuss in order for him to satisfy them. Therefore, the word paynuss came to mean what it is today.
My friend Forrest is said to have quite the paynuss.
A: I wonder where the word penis came from?
B:Dude don't you know about paynuss?
A: Ah of course, that guy nuss must of had a mammoth dick