A holiday celebrated every August 4, enacted by cs188 in 2016. Not much is known about it, but as the day's name suggests it likely involves stretching butts.
"WOO-HOO! It's International Buttstretcher Day, ha-ha-ha-ha! Awww yeah......awww yeah......"
When an anal enthusiast waxes his or her asshole hairs with pomeade in order to have a pencil thin butt hair mustache. One must remove all butt boogers before applying so it glimmers in the light and your lover can truly appreciate the pencilton-buttstache.
I was humping my bitches brown eye and her pencilton-buttstache kept stabbing my balls! I would have to admit though... it was an impressive pencilton-buttstache!