1) A mythical island off the coast of Japan which is home of Godzilla.

2) The island of Manhatten.
1) "Our instruments show evidence of seismic activity on Monster Island!"

2) "Gonna be stomping Monster Island on the 16th, you down?"
by dasmb January 17, 2005
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The free weights area of any gym.
Harold wanted to learn to lift weight, but he was intimidated by the denizen of Monster Island, so he went to Body Attack instead.
by StSeanoftheKnife May 12, 2013
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The only place where you can have sex with different monster girls in 3D.
Person A I wish I could fuck a shark...

Person B Have you heard of MGI?

Person A MGI? What is that?

Person B Monster Girl Island, you can fuck different Monster Girls there, including a shark with huuuuuuge abs.

Person A Where can I find that?
by No_one_of_concern April 26, 2022
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