Noun - A fleshy, flappy and hangy woman's vagina characterized by a brownish hue.
The girls Roast beef au jus was so foul it looked like it could be put in a roll with some gravy, horseradish and a slice of provalone cheese.
by Murph McGirt December 10, 2003
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When a guy eats a woman out after she’s banged multiple dudes.
Stacy came home after a girls night out last night and I wanted to surprise her, but ended up eating a roast beef sandwich with Mayo instead! That cheating whore!
by Reversecougar00 December 23, 2022
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Labia with a tinge of brown. Though they may appear to be fresh roast beef, do not try to serve them on a po-boy with gravy. Roast beef drag lips are, in fact, stained vagina.
Your grandmother asked me to help her douche. But when I noticed she was kicking the roast beef drag lip, I gave her a cunt punt.
by Anne Marie Vandencunt June 9, 2006
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Roast Beef Mud Flaps are the oversized lips of the vagina that resemble the mud flaps on a semi truck if they were made out of roast beef. This phenomena is often related to the woman having an excess of sexual partners, and/or extreme stretching by the use of sexual toys.
Chris: Hey man, did you end up hitting that last night?
Ken: Yeah, but it wasn't that great.
Chris: Why not?
Ken: Well, she had a massive set of roast beef mud flaps.

Chris: Were they that bad?
Ken: Yeah, it looked like she road a chainsaw to work everyday.
by Queef Chief April 26, 2016
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The lubricant of choice for a loose meat sandwich found in the rut of an old snapper.
Tracey brought her own au jus to lube up the loose meat sandwich. I asked her if that is supposed to be used for real food, and she told me to shut it and get back to work, kinda like Rabbit's boyfriend does.
by rick9plus May 9, 2005
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Not only is this a beat up vagina with large lips hanging down, but the women is so fat her roast beef is marbled with fat. Even worse than simple roast beef curtains.
Rob hated that his girlfriend so was so fat-- she went beyond the already disgusting roast beef curtains- She had massive marbled roast beef curtains! The worst of the worst!
by BP310 July 19, 2010
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