Definition of boat
boat is the English word for "boat". At poker, several words exist to designate a full hand. boat is one of them. A full hand is when we have a pair plus a three of king. If you have AA in hand on A-2-2, we have a "boat". Full hand, full house, boat, are all synonyms for the same hand. On the poker's in the casino, you will hear all the expressions at an equal frequency. Players who want to show other players that they weren't born yesterday will use "boat" more often than a full hand. The expression gives the impression that you are more learned, more familiar with the game.
The poker is the marine analogy
boat is not the only term that refers to marine vocabulary. We talk about the turn, the river, a float (when we call a bet with the intention of bluffing on a street to come), a boat, etc. There are also analogies in relation to the Far West (we will speak of a barrel as a shot when we bet, kings preflop are named the cowboys). On the other hand, on a table of poker, it is always better not to spread our knowledge too much to other players so as not to arouse their mistrust of our skills!