Boat is a slang term for a full house—a three‑of‑a‑kind plus a pair.
Explanation. The nickname “boat” likely evolved in slang to evoke a “full” vessel—just like a full house holds strong. For example, holding two Kings with board showing K‑10‑10 gives you a boat. It’s one of the highest-ranking hands in poker and often wins large pots. The colorful term persists across live and online play.