A party or bar full of men when the opposite is desirable.
Pete: "I don't like the ratio at this party, and my chances are slim to begin with."
Bryan: "Yeah, it's a pirate ship. Let's bounce, but first I've got to get this girl's digits."
When you're not in a full relationship with the opposite sex, but it's also stronger than a friendship.
Person A- " Are you in a relationship with Jacob?"
Person B- "No"
Person A- "Oh, so you're just friends?"
Person B- "Well, no not really"
Person A- So it's a relationship?"
Person B- "No, actually it's a pirateship"