Duck + Fuddy.
Duck- Slang A person, especially one thought of as peculiar. Fuddy- from the term fuddy duddy. An old fuddy duddy. An old guy.
Rymes with Buck fuddy , see definition.
A peculiar old guy looking for sexual encounter (s)
My 50 yo virgin cousin peter is such a duckfuddy, he's posted an other peronals ad on Christian Mingle.