Spaghetti Dinner refers to the recruitment meetings of cults.
In places like Universities, you will be offered to come to Spaghetti Dinner. There, they will start telling you about their cult and try to convince you to come back.
The spaghetti will probably be laced with drugs intended to render you unconscious, or make you more receptive to their Doomsday predictions.
If you refuse to join, you'll probably wake up in a bath tub with a scar from where they removed your kidney.
Hey John, come to our Spaghetti Dinner! It's free!
A guy receives a spaghetti dick after having sex with a girl on her period. After cumming, his now flaccid dick resembles a noodle and the girl's period blood resembles the spaghetti sauce.
Amy: "Baby, I want to have sex."
Brad: "Aren't you on your period?"
Amy: "Yeah so? We can still have sex on my period."
Brad: "Eww no I don't want a spaghetti dick."