ships in the harbor
Ships in the harbor is when your underwear is in your butt crack. It is also known as a wedgie.
I told my girlfriend her ships in the harbor. She had to go to the restroom to get her underwear out of her butt crack.
That ship is in my harbor
An expression based on the expression "that ship has sailed," which is when an opportunity has passed you by. One uses "that ship is in my harbor" when one manages to grab the opportunity.
Friend 1: Do you think Matt hooked up with that girl last night?
Friend 2: I don't think so. Anyway, that ship has sailed..
Matt: (eavesdropping..comes in wearing leopard print robe) Nope. That ship is in my harbor.
Friend 2: I don't think so. Anyway, that ship has sailed..
Matt: (eavesdropping..comes in wearing leopard print robe) Nope. That ship is in my harbor.