The action of showing someone how to "scratch it" the first evidence of this dates back to circa 30–33 Anno Domini, in Judea, a city in the Roman Empire, where Jesus was being crucified. When Jesus died, before he was sent back to his body, he was lectured on many philosophical ideas from Thanos himself. Where he spoke of the chicken and the egg, and of course, a demonstration of how to "scratch it."

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)