While fucking a skank in the ass, you strike a solid turd plug. Upon discovering this buried treasure deep in her booty, you scream, "ARRRRGHHH!", like a pirate.
Last night sucked, man. I was ass-fucking your sister and hit Pirate's Treasure. That girl needs to eat more greens.
The treasure that is pussy nectar. Released when you've tongued a girl's pussy and clit so well that she can't help but spurt her pussy juices all over your tongue and into your mouth.
Ex: Spread those legs and let me plunder your pussy with my tongue for some sweet tongue treasure.