"The flap of vag that extrudes from the lips. Thus giving the illusion of a roast beef sandwich. Thick beef or shaved, either way "bon appetit"
Adam: "Hey Leeroy, wanna get some lunch?"
Leeroy: "Nah man, had some nasty roast beef sandwich lastnight"
Adam: "Hanging with my sis again"
Leeroy: "Yeah!"
by tayfromthebay July 25, 2006
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the well had portions of a chick's fuck hole the hang after a long ball session. Much like meat curtains
dam I banged her so hard it looked like a roast beef sandwich when I was done.
by J.F. February 12, 2003
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a distigusting vagina also soemtimes known as mac n' cheese should not be traded for prime rib

a.k.a. - kaitlyn
oh jesus gil you gave up prime rib for a roast beef sandwich?
by not chris turner November 23, 2007
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A portable method of dining upon meat and cheese. Roast beef and a cheese slice of whatever sort is placed between 2 pieces of bread, or 3 for a double-decker, 4 for a quad decker, etc. Sauce and vegetables are usually preferred.
I was quite famished when I returned home, so I prepared a roast beef sandwich to quell my hunger.
by kvkvjkvgcgcgh v vo May 21, 2011
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When you fuck your cousin so hard her pussy falls out so you put some bread and mustard on it and eat her out.
Me: bro i ate a mississippi roast beef sandwich last night!

Friend: that sounds awesome, what is it?
Me: my cousin!
by bigboy992 March 29, 2021
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I rather loose vagina found on nasty sloot doggies who sleep around a lot. Some men might find it attractive but others prefer a nice tight vagina. All personal preference.
"I noticed after Lucy stopped using her vibrator every night her roast beef sandwich tightened up" Ken
"I remember the first time you fucked, you had to stick your dick and her vibrator in at the same time" Ed
by toeingmywayintokiki August 07, 2016
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Terminology for the process of performing oral sex on a woman.
A friend of mine gave me that analogy after he ate his girlfriend's hairy muffin; "It was like a side-ways roast beef sandwich."
by Primo March 30, 2005
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