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A high school that is extremely below average, whether it is in athletics or just general living.

Located in Rumford, Maine, Mountain Valley harbors a serious grudge against Cape Elizabeth High School students simply because their football team's skill greatly surpasses that of Mountain Valley.
Who the fuck goes to Mountain Valley anyway?
by Mointain Valley-goer February 18, 2009
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2
Girl on Boy action when the girl places the mans penis between her mountanious boobs and slides up and down his body.
Yo bro i got a sweet mountainvalley from that bitch after my lax games

Yo bro did you take advantage of her and mountainvalley the milk out of her
by FAOTHEFiD December 22, 2011
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