Unknown to most of the world, is the fact that John Calvin created this "signal" to secretly confirm the belief in the five points of Calvinism in the public square. Below is a painting of John Calvin high-five-ing William Farel, who is just outside the painting.
Arminians use this gesture without knowing the significance behind it.
Below is a photo of two Arminians after a successful snake-handling service.
"High five" was also used by Jonathan Edwards, A.W. Pink and Corky Velveeta.
So next time someone says, "Gimme five"...explain the origin and be on your way.