Like spagbol being short for spaghetti bolognese, Tagbol is the abbreviation of tagiatelli bolognese, probably also coined from someone who couldn't pronounce tagiatelli bolognese in the first instance.
Leon: Fancy coming over for dinner tonight mate?
Mark: Can do, on my own tonight, what you having?
Leon: Lisa is making Tagbol.
Mark: Nice one, Tagbol is my favourite.