Top Definition
Having such a massive bowel movement that it piles up until it reaches out of the water like an island that is made by an erupting volcano.
I ate way too much last night at the happy hour buffet and just Mt. Fuji'd the executive washroom.
by Corporate A-Hole December 29, 2011
"Too much", like a big pile of munchies you can't eat because it's too much... or just used instead of "too much"
Oh man, Mt Fuji ramen man, can't eat all that...
by Iceland slang leader.......... October 01, 2008
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