Coined by the dyke punk band Rusty Curtains. Used to describe the following types of Vaginas:

1. Blood covered/coated. Usually because of menstruation.

2. A vagina that has not seen play in a while.

3. An old scary vagina, that you fear may give you tetanus.
Example for all 3 definitions:

She had rusty curtains. I fucked her anyway.
by Majestic Majesty January 18, 2014
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During felatio, the felatee reaches across the back of the felator, inserts their middle finger into the felator’s anus and lifts them up, thereby suspending them in mid-air like a curtain hanging from a hook.
She was merrily giving me a blow job when I surprised her by reaching over and giving her a rusty curtain hook.
by Russ T Curtainhook January 27, 2020
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