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The Grand Canyon refers to a girl who is extremely blown out. The relevence of this term is that, just like the real Grand Canyon, the chick's vagina is forever stretched for for a huge distance. Girls with Grand Canyon twats should be avoided, as they have seen more than their fair share of dicks and probably contain numerous STDs.
Justin decided that he was going to have sex with his new girlfriend Megan, but when he took off her clothes he wisely decided to back out, due to her Grand Canyon vagina.
by Tit For Twat January 18, 2007
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Big expandable pussy that can fit numerous dicks inside.
Stretched pussy
Lady: He is small
Man: Maybe the ball park was too big, even a 747 (jetplane) looks small in the Grand Canyon
by tl December 25, 2003
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Janet Reno's crotch.

See: alcove, bat cave, bear trap, bearded clam, bearded taco, beaver, bermuda triangle, box, bucket seat, cake, chuff box, cockpit, cooch, coochie, coochie-pop, coose, cooter, cooze, crack, crawl space, cum depository, cum dumpster, cuntcake, cunt, cunny, donut, dripping delta, felted mound, fillet-o-fish, finger hut, fish, fish taco, front bum, fly catcher, fuckhole, garage, gash, gates of Heaven, golden doorway, growler, hair pie, hatchet wound, heaven's door, hole, honey cave, honey pot, hot box, jaws of Hell, lobster pot, loins, loose meat sandwich, lotus, love box, love canal, lower lips, meat wallet, muff, nooch, nook, nookie, parking spot, peach, pearly panty gates, pocket, poon, poontang, purse, pussy, quiff, quim, rat trap, scratch, sheath, slash, slit, snapper, snatch, space, split, stench trench, tampon socket, temple, thingy, tool shed, tuna, tunnel, twat, undercut, vagina, vertical smile, wishing well, whisker box, womb, x, yoni
I could see for miles in the Grand Canyon.
by T. J. October 30, 2003
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While having sex with a girl, grab a rolling pin or other large shaped object and ream her twat. once you pull the object out and her gash is gaping, yell into her twat lips "Hello" and wait for the echo.
by DRJ12341234 October 13, 2011
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