What is 69 Tombstone?
When you are doing 69, but once you have blown your load into her mouth you perform the popular wrestling finisher "The Tombstone Piledriver" thus knocking her out so you dont have to have after sex talk and you can just go to sleep.
Jane - "Fuck me John, ive got a banging headache. I didnt even drink that much last night."
John - "Maybe you drank more than you remember, and we did do a 69 tombstone, i mean 69"
Jane - "Yeah Maybe"