It reminds me of toothsome – and the sexiest mom on family television in the early 1960s. (Why can't I find a picture of her in Capri pants that does her justice?) But then, of course, it would need another "o".
I used this word on the web and when challenged to prove what it meant could find only a definition suggesting a multiple sexual connection. In fact, as adjective, it describes food and means simply you want more of something. Example from the Web about a spaghetti carbonara recipe: "It's very moresome and because of the light meat content it can be tempting to go for a second serving so I would recommend having a side salad on hand".