Top Definition
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."
by GeorgeIsEnglish November 22, 2013

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