There are a few different interpretations of "fish man" depending on the context:

• In Cantabrian mythology, the fish-man of Liérganes is an entity that is said to be an amphibian human-looking being, resembling a metamorphosis of a real human being who was lost at sea.
• In the anime and manga series One Piece, fish-men are one of two humanoid races that inhabit and rule the seas (the other being the merfolk) .
• "What the fish man!" is a phrase that can be used as an exclamation of surprise or confusion, as seen in a YouTube video with that title.
• According to Merriam-Webster, a fishman is "one who cleans fish in preparation for cooking".
• In Urban Dictionary, "Fishman" can also refer to a man who is an expert on various males nipple sizes.

Its important to note that the term "fish man" can have different meanings depending on the context, and its always best to clarify which meaning is intended.