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1.
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.
Mr. Bean was windmilling the school children.
by Haddock December 16, 2004
 
2.
Spinning your arms to hit someone with intent to injure.
I like windmilling Mags because they stink.
by @@@ September 29, 2007
 
3.
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 chick singer 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!
by blackhawksfan54 February 09, 2010
 
4.
clutching ones flacid penis at the base, and waving it in a similar motion to that of a windmill
howard was windmilling bolder at the pub after 8 pints of vodka snakebite, and 8 apple sourz.
by howie December 01, 2003
 
5.
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....
by WatchOutCosBeadlesAbout September 02, 2009
 
6.
The act of your ridiculously large rims spining
I'm dumb windmilling like the hills of Livermore
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
by Jizzo Fortanel July 19, 2009