"Gimme my neck" is sort of a game. When someone says anything incorrect, you say: "Gimme my neck!" Then you rub your fingers (index finger and middle finger) as hard as you can behind the person's neck.
Boy: You said tomorrow's my birthday? It's next week! Gimme my neck! *rubs fingers behind the girl's neck*
by Lala Yamada February 15, 2008