This should be an easy sell for Heavy Metal and UT Sports fans because it’s the same hand gesture! Plus it’s a European insult (with a little modification) and Ronnie James Dio learned it from his Italian granny as a way to put a curse on someone!
But first, use warm water and soap or sanitizer. Then bang your head all day, yell “Hook ’em Horns” or get punched in the face by a jealous husband.