Top Definition
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
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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