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2.
Little invisible monster that grabs the hair on a guy's arse when shagging. Pulls the hair back and forth as hard as possible, resulting in the guy increasing his stroke rate to previously unimaginable speed.
Girl 1: "So, you got it on with Andy last night huh? How was it?"
Girl 2: "Andy was such a considerate lover until the point that the arse hair demon entered the room. Then he just pounded the shit out of me."
by Scotsdave March 14, 2006
 
1.
Alternate spelling, "Arse-hair demon": An extremely small, gnome-like creature, with powers of invisibility, who sneaks up on unwary victims, and gives their perianal hair a sharp tug, causing them to shriek, and/or leap skyward, for no outwardly perceptible reason.
Ariel and Deanna were enjoying high tea with the Queen, when HRH suddenly gave a sharp yelp, and leapt from her seat. Royal Guardsmen rushed towards the table, but Her Majesty waved them off, stating, "Bugger off, ya sods, 'twas merely a wee arse hair demon, ticklin' me hindparts."

by Sir Neville W.F.G. Mariner, April 03, 2006