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1.
The act of a woman jacking off a man with sandpaper, thus creating the "red shaft"
So I was finally asked out by Billy last night. Everything went well, food was good, and we went to an awesome concert. But it all went downhill in the bedroom when he asked me to give him a red shaft.
by A Wave of Babies TWAS February 23, 2009
 
2.
hitting your shaft to hard and causing irritation, during masterbation.
I got a redshaft lastnight from angela, she hits hard
by xgf February 18, 2005