My grandfather is a great fisherman, especially at baiting a rod.
I guess you could call him the Master Baiter.
Master Baiter Fisherman
Explanation
Explain Bear
Alright, listen up, nimrod. This joke is playing on the double meaning of "master baiter." On the surface, it's about fishing and baiting hooks. But, the joke is really using "master baiter" as a euphemism for... well, you know. I know you don't, since you are slow, but others might!