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1.
a very very very VERY wooly vagina.
I remember all the mammoth caves from the 60's.
by Cake Beard the Pirate May 22, 2009
 
2.
a deep, dark abyss (ass hole) in which large mammoths (shit) dwell. When the mammoths (shit) become too crowded they tend to exit the mammoth cave (ass hole) in a hasty manner.
"My mammoth cave is way too crowded man, i need to release some mammoths."
by Joe Mingus December 02, 2006