It consists of ass hair / pubes as the spaghetti, the dingleberries as the meat mince and any residue bodily liquids (normally diarrhoea) as the sauce.
Usually a meal for one but can be shared.
Matthew: "Yo, what did you have for dinner last night?"
Michael: "I had my girlfriend's dingleberry bolognese. It was delicious"
The legend behind this phrase is that if you have a thot and you don't put them in water then they are just a thot. But, if you take a thot and you drown them in boiling water then they go limp and floppy like spaghetti; resulting in a BOLOGNESE THOT (you can't say it without exclaiming it).
"That party was mega!"
"I know, a girl was even passed out on the floor like a BOLOGNESE THOT".