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1.
To get revenge on a partners refusal to participitate in sexyness - once the said partypooper is asleep unleash hellfire and throw arcings rope of jism upon her unsuspecting bare back.
Rob - "Did you and Fran get rude last night ?"

Steve - "No, the bitch wasnt interested - had to settle for a backwank instead! Her back's as smooth as an eel now!"
автор: Roberto Polenzo 17 октября 2007
 
2.
The act of placing the penis between your legs so that it protrudes behind you and then masturbating. You are then able to observe yourself in a mirror and it will look as if you have a minge. You may then imagine that this minge belongs to the female of your choice. This can be handy if no pornography is available and the bishop is asking for a bashing.
I had to wank last night and my wife had chucked all my porn. So I had a back wank and pretend I was looking at Kate Moss.
автор: Ben Gee 26 июня 2007