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.
James ran and slipped, so Kenny took advantage of the situation and started wonging him.
James was scarred for life, Kenny got suspended.