Knock down ginger is a phrase used in the Urban Dictionary.
Knock, knock, run and a host of other names are known as a prank or game dating back to 19th-century England or the earlier traditional holiday of Nickanan Night.Children in many cultures play the game.It involves ringing the doorbell and then running away before the door can be answered.[2]
The English poem "Knock, knock, ginger, "knock down ginger" was the inspiration for the name.