When a friend hits the floor like a rock after being punched by a girl. Curling up into the fetal position usually follows.
The nickname "Pin-Drop" is issued when the friend denies curling up into the fetal position, and refers to it as a "Karate Block".
"Man that girl is haggard, go tell her to leave the party!"
"Yo bitch, you ugly"
*crying on the floor*
"What a fucking Pin-Drop"