Definition of full
Boat is not the only term that refers to the marine vocabulary. We speak of the turn, the river, a float (when we call a bet with the intention of bluffing on a future street), etc. There are also analogies to the Wild West (a barrel is referred to as a shot when betting, preflop kings are called cowboys, etc). On the other hand, on a poker table, it is always better not to display our knowledge too much to the other players so as not to arouse their distrust of our skills!