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.
Often used in conversation to demonstrate an anger towards a specific subject or entity.
Tim: Right, I'm off windmilling....
All I gotta do is put up to get the whore
She licked the door, taste the candy
Caught diabetes from the dumbass candy
This dumbass man be ridin' on 4's
Knocking the bitches and cold clockin' the hoes
----------Husalah --- Cutty