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The state of being whereby a person is adorable as a result of their being sexually aroused.
Appropriate Use:

Boyfriend: I can't help it! Just seeing your nipples makes me want to touch them.
Girlfriend: Aww, you're so horndorable.

Inappropriate Use:
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.
by Horndorably Yours December 04, 2010