The act of masturbation, when the person shouts the name of a person in the vicinity, and then stares them in the eye when they come to investigate.
Steven is having a "good time" in his bedroom.
Steven: BRUCE WILLIS!
Bruce Willis bursts through the door, stangling a panda.
Bruce Willis: What did you want?
Steven stares him in the eye, awkwardly.
Bruce Willis: DID YOU JUST THUNDERWHACK!!!
Bruce Willis eats Steven's spine.
Steven: BRUCE WILLIS!
Bruce Willis bursts through the door, stangling a panda.
Bruce Willis: What did you want?
Steven stares him in the eye, awkwardly.
Bruce Willis: DID YOU JUST THUNDERWHACK!!!
Bruce Willis eats Steven's spine.
by Neener 2: Electric Boogaloo February 20, 2009