While in 5th
on the list - the term originates from the early 90's and should be number 1. It has
nothing to do with penises or arms.
Windmilling defined: with regards to thrash metal and extreme music. This definition predates the others- listed here.
Windmilling is the act of a long haired metalhead whipping his/her head around in a 360 degree motion, the hair flies
up in the air and around- in the shape of a windmill blade.