A chin strap left to hang out for six months.
A woman repellant.
Also the most disgusting version of facial hair possibly grown.
"Brian tried to have a bite of my spaghetti but it got lost in his Curtain Rail."
"The guy was really nice, but he had a Curtain Rail."
"I can't find my second born child, I think it's in my man's Curtain Rail."
"I couldn't afford a mop, so I just used my Curtain Rail."