The "Boat" refers to the size of a penis. The expression is used when a person says when he/she talks about penis size. This statement is usually countered with the motion of the ocean.
A bro, a man who is all about size. A size guy makes sure he eats enough food through out the day to gain size, mainly in muscle. When not hitting on hot babes you will find him in the gym, putting on size.
Did you see Todd leaving the gym looking super swole in that bro tank with that super hot babe? He is such a size guy.
A Size King is a well-endowed man who actively seeks out size queens (men who only like huge dicks). Some men who are hung become size kings because they like to be with men who will really focus on their penis and it's size. A true size king advertises his endowment to "bait" potential size queens.
"You're sure showing a lot of dick bulge tonight, Dan."
"Of course I am. I'm not going to hide it...I need to meet some size queens at the club, and I want them to know that I'm a Size King"