The state of being whereby a person is adorable as a result of their being sexually aroused.
Boyfriend: I can't help it! Just seeing your nipples makes me want to touch them.
Girlfriend: Aww, you're so horndorable
Man: If I were 40 years younger, cutie, I'd show you a good time.
Girl: Aww grandpa, you're so horndorable
Jimmy: Sorry Ms. Frizzle, I couldn't finish the essay last night because I was procrasterbating
Ms. Frizzle: Jimmy, as horndorable
as that may be, I will not be able to give you an extension this time. You can earn back that credit in detention.