Def. 1-When that one catchy song comes on the radio and you are alone in the car and you secretly dance to it
Def. 2- That giant thing from the third Lord of the Rings movie that rams down the door of Minas Tirith
Def. 3- A sex position
1.Oh kids, back in the day whenever "We are Number One" by LazyTown came on the radio your father and I use to get all wild up in there!
2.When Gandalf saw the Head Basher approach the city, he knew they were fucked
3. Me and (Insert Trashy White Girl Name Here) performed the Head Basher in our room last night at the motel.