Billyboy is a slang term that can refer to a variety of things, including a young boy or man, a pimp, or a type of boat. If you're looking for synonyms for this term, here are a few options to consider: dude, lad, fella, young buck, entrepreneur, hustler, mack, playboy, gigolo, yacht, vessel. Depending on the context, these words can be useful alternatives to Billyboy and can help add variety and nuance to your writing or conversation. Whether you're looking for a playful or more serious term, there are plenty of options to choose from.