To cock slap a person while said person is
on the ground.
It's derived from a kid from California who was kicked out of high school for
sexual harassment. His last name was Wong. He was kicked out for sexually harassing girls.
One day during P.E. one kid was running and tripped. He fell to the ground. Wong came up to him, pulled out his cock, and
cock slapped him. So "to wong someone" means to cock slap a person while that person is on the ground.