The Jo-Nasty Share definition Flag the cat of "the Jo-Nasty" is this: you have sex with a male cat. Named Joey. After my cat. I did the Jo-Nasty last night. The Jo-Nasty by Incogmumpis May 8, 2004 0 0 Get merch Get the The Jo-Nasty mug. Buy Now — $32.95 See more merch