Credibility and the PI

A friend, let's call him Saul, delights in calling me Dodgy *** - which in itself is fine - but also refers to me as the same when talking to his acquaintances and co-workers or when introducing me to others. He insists that his colleagues know of me not as *** (who happens to be a Private Investigator), but as Dodgy *** the PI.

Of course there is nothing remotely dodgy about me or what I do, but I have been wondering if there might be something I can tap into there in terms of marketing?

I'm just not sure "Dodgy ***'s Cut-Rate Investigations" is exactly going to attract the high-calibre client I am eternally looking for.