When you fist your misso from behind while anally penetrating her. You then proceed to masturbate yourself while balls deep in her ass and fisting, through the thin wall between her pussy and ass
I performed "The Tenni" on the misso last night. She wont be able to shit right for a week now!
The Dirty Tenni
When a bloke anally penetrates a woman with his penis whilst also vaginally penetrating her with his fist. Then proceeds to masturbate himself through the thin lining between the womans anus and vagina...
Nathan sat and watched as his wife received The Dirty Tenni from behind.