When written on the back of a car/truck your passing on the highway; typically means the driver/passengers wants you to whip them out. Also known as whip 'em out wednesday.
"While passing by a truck with wow written on it, one wednesday afternoon, 5 yr old Joy asked 'Daddy what does W.O.W mean?' he said; look at your mother."
by syx.t.nyne May 19, 2009