Handbanging 

male masturbation.

Cliff: Where's Timmy?
Timmy's Mom: He's upstairs handbanging.

Handbanging by NADERAGE July 7, 2010

windmill headbanging 

To headbang in a circular motion.

When someone's listening to hard rock/heavy metal reaches to an epic level, normal headbanging can't coupe with the sheer power of it. That's when windmilling comes to play.

Goes great if the person has long hair and a brain as strong an Air Force pilot's ('cause it'll gives you some fucking powerful headaches if you're not careful).

Windmill headbanging, harder to do but much more fun to watch than normal headbanging.

"Fuck, man! Listening to Amon Amarth, Morbid Angel and Cannibal Corpse is giving me the urge to windmill my head off!"

windmill headbanging by RROMM August 28, 2007

headbanging 

swinging your head up and down as hard as you can as if to almost rip it of, while listening to heavy metal music

Yeaaaaaaaaaaaaaaaaaaaa i was headbanging to some metallica, and i got whiplash, it was so fucking hardcore

headbanging by GIANT(in my pants?) May 28, 2008

handballing 

The art of stuffing your hand and arm into your parteners anus.

similar to fistballing

Note: sitting may cause discomfort after fistballing

Using the powerfull techniques of handballing Bill gently stuffed his fist and arm into Al's secret anal space.

handballing by skin May 20, 2004

handbalming

Offloading product or stock from a truck or a pallet in a warehouse by hand, usually in a quick, orderly manner. The word is often mistaken for "handbombing", which is how it is pronounced.

The forklift is broken, so we've been handbalming all the stock ourselves.

handbalming by ExpertTrucker March 9, 2009

handballing 

Fisting, as practiced anally among gay men.

Handballing is a true expression of boy-love

handballing by cornholio October 16, 2003

HandBagging 

The fine art of taking a Dump in someone's handbag without them knowing. A great way to impress your dissatisfaction with someone for leaving their handbag somewhere accessible. Not advisable on first dates or when taking elderly relatives to dinner.

Handbagging is often preformed on a night out when a really annoying girl (or guy (doesn't even have to be annoying (just has to have a handbag))) and you get the opportunity to grab a handbag on the way to the bathroom or anywhere else you are comfortable doing 'the deed'. Not being caught is usually advisable.
Also good for a competitive game with mates seeing who can get the most or the best bag!

HandBagging by Gymsox June 13, 2011