This is when you masturbate in an unusual way.
You could be upside down at the time, using two elbows, your feet, sports equipment or rolling pins.
The purpose of extreme wanking is to spice up your wank life
Extreme Wanking example

The Andre Agassi : Double back hander

1. Assume a seated position
2. Point your legs to the heavens.
3. Put your hands underneath your legs.
4. Put both hands around your penis.
5. Enjoy!
by G-spot and McScrote May 10, 2007
Get the Extreme Wanking mug.
The art of masturbating till near climax. Whereabouts you shout: "Hey mum come here a minute!". You then have the time it take till you mum arrives to finish jacking off and get cleaned up.
by Alex and Rob February 19, 2003
Get the extreme wanking mug.
A regular Danger Wank, with the added Danger of another person/enemy/vicar being IN THE SAME ROOM as you. Includes if the person is asleep, passed out or pre-occupied with the other gender.

N.B. This does NOT apply behind a closed door, eg. in a toilet cubicle. Too easy.

N.B. The other person CANNOT be your girlfriend/partner.
Ed: I had an extreme danger wank whilst my mum was in the room.
by ed chrisleni January 4, 2009
Get the extreme danger wank mug.