A "broseidon" is a playful term that combines "bro," a slang term for a male friend or buddy, with "Poseidon," the Greek god of the sea. It typically refers to a laid-back, fun-loving guy who embodies a carefree, beach or party lifestyle, often associated with Surfing or ocean activities. The term is often used humorously to describe someone who is friendly, adventurous, and embodies a strong connection to the sea.