An exclamation one uses when overcome with emotion at the sight of an extremely attractive individual.
(Pants dropping indicating one of being ready for sexual intercourse at first sight of said person)
To a friend: "Wow look at our subsitute man! Pantsdrop."
Twitter: "So excited to see the new movie ____ , with ____ in it! #pantsdrop"
Facebook Picture Comment: "pantsdop"
*Note: Pantsdrop is still effective on your own out in the world, but one or more of the four W's MUST be used afterwards
Alone: "Hey, were you watching my beach vollyball game?"
"Pantsdrop... What !?! Where !?!"