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The luscious protruding inner lips of a woman's vagina which is men’s favorite part to suck on during oral sex.
These inner lips are particularly sensitive and touching them makes the woman orgasm.
The inner lips of some genetically blessed women grow larger during puberty.
The inner labia of the majority of women more or less protrude beyond the outer labia but since the protruding lips are considered too sexy (too graphic) for soft porn, the guidelines mandate digital removal of these parts before getting them published. So virgin guys who are used to jerking off to porn pussies are not aware of this trait of real-life pussies.
1.My girl’s roast beef curtains can kiss my dick at the same time she’s kissing my lips. It makes me and her madly horny!!!

2.I love rolling my wife’s roast beef curtains around in my mouth. Sucking on those juicy pussy-lips sends me and her to heaven!

3.Mike doesn’t know how sex works. I laughed so hard at that virgin dude when he said he thought girls can get their roast beef curtains stretched out during sex hahaaaaaa
by smartyass March 24, 2010
When a vagina has been excessively sexed to the point that the lips looks like curtains made out of roastbeef.
Yo Fez did you see the Roastbeef curtains on that stripper?
by Tom Molnar October 19, 2007
Ex 1. When a girls pussy is so loose that it looks its throwing up, and there extra meat hanging out.

Ex.2 A certain Summer Set re-rack in beer pong you can only get when you have 5 cups, the vagina with a little extra or a diamond with one at the top aka roast beef curtains.
Ex 1. "You know that girl Dubbe, I heard she got a case of Roastbeef curtains"

Ex.2 "Let me get Roastbeef curtains" (While doing a Floppy hand waving with motorboatin your lip)
by Trizzle Tizzle October 12, 2009
a floppy, open, or gaping vagina
dude how was shelly. man she had a fuckin roast beef curtain....shit was gross
by creag December 27, 2005
loose folds of skin which hangs from either side of the vaginal opening on some women
"I needed bungee cords and clothes pins to keep her roast beef curtains out of my way as I orally pleasured her."
by Scott Martin June 29, 2006
the female labia majora and minora
thumb tickler
pink taco
She farted and her roast beef curtains moved.
by kathryn million August 04, 2006
the outer streached out portion of the vagina-especially after hard vaginal intercourse or gang bang.
I beat up her vag so bad last night she had roast beef curtains.
by wackjack9 March 12, 2009