The horse tail is the action a woman makes when an unwanted appendage (finger or penis) is about to enter her rectum. The horse tail comes out exclusively during doggy style intercorse. While in position, she will wildly swing back one arm to swat the unwanted appendage from entering. It resembles a horse's tail swatting flies of its ass.
I tried to take this chicks ass last night, but her horse tail came out and thwarted my attempts!
by philthy rich April 07, 2007
a male with a long ponytail
justin & aaron have horsetails
by nerd herd October 15, 2003
The act of placing a short broom in your partners anus and riding them around much like a horse.
My wife was never really fond of the old Horse Tail, i usually only got it on birthdays.
by R.U. June 25, 2003

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