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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.
Related Words

power wagging

A term coined by NBC's 30 Rock. It's when you shake your index finger at someone to make a point to whatever you're saying. First used in a season 5 episode called "Plan B" by Jack Donaghy (Alec Baldwin's character).
Liz - "You're looking out for us, right? Pounding on desks and doing whatever this called." (she's shaking her index finger)

Jack - "Power wagging."
power wagging by TURBO1NIX April 16, 2011
its a wigger that is a ginger.
Look at cody over there with his tall tee and bubble vest. What a wigginger.
wigginger by itisfact March 25, 2011
To ditch an event or school
"Hey Damo,what did you do on Tuesday?"
"I fucken wagged school because i'm a real Aussie cunt"
"Hey maybe you shouldn't wag school"
"HEY SHUT YOUR BLOODY MOUTH BEFORE I MAKE YOU.Wagging is what a true aussie does,unlike you Clancy"
"Wagging is what a dipshit bogan does because he hates school,and i'm a dipshit bogan that hates school"
Wagging by Wagging April 4, 2015

the tail wagging the dog 

This means that the least important part of a situation has too much influence over the most important part.
Bob:Honey, let's buy new purple carpet to match the purple lamp shade.
Wife:This sounds like the tail wagging the dog.

wigging out 

To freak out or to start freaking out. Usually when inebriated under a variety of substances.
John is wigging out!
You're wigging out dude!
wigging out by ^MisterJingo^ December 18, 2003