How tf did this ever become a thing

Like I know obviously it's just a funny excuse to punch your friend the same way a VW Beetle is but like,

"make a ring with your fingers and hold it near your dick and then call for your friend's attention and then when he gives you attention, proving that he's a good friend that listens to you, laugh at him and then punch him in the kidney"

Does this not seem insane to anyone else, I have to know the etymology of this but I don't know how to look it up