Occurs during a game of billiards, in which your opponent(s) accidentally hits the cue (white) ball into a pocket. You then proclaim the term "Pirate's Scratch." If delivered repetitively with the proper tone and dialect, your opponent will become extremely aggrivated. The need to know exactly what a "Pirate's Scratch" is will become overwhelming. At this point, you must make a habit of putting the word "Pirate" in front of every pool term. Oh yeah, it doesn't mean anything.

the whale tail is the shape formed when a g-string rides up high over a womans trousers