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.
Did you see that chicksinger windmilling in the that new metal video the other day? She windmills just as good if not better than some guys can, and looks hot as hell- doing it!
The act of spinning one's penis around in the fashion of a windmill, usually with the intent of hitting someone in the face. Sometimes done while urinating.
Verb; To whirl one's outstretched arms around in a circular motion, fists clenched, with the intention of hitting something (or someone). This action resembles the spinning blades of a windmill.
Often used in conversation to demonstrate an anger towards a specific subject or entity.
Nick: I heard that John slept with your bird last night!
Tim: Right, I'm off windmilling....
A bath consisting of a variety of slats, oils, soaps or any other added ingredients such as fruits, milks, herbs or any other spices for health or beautifying benifits.
She brought home alot of stuff and took it to the bathroom. She must be taking a witch bath.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.