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Comes from hair products called mousse. When going out to party any night that requires preparation, that has build up and always ends up being fun/exciting is mooosey.

A great, outrageous, wholesome, fun, wild night is a mooosey night.

Pronunciation emphasis on the "o's".
last night was mooosey, tonights gunna be a moose-moose night, monday nights are still mooosey
by g-smoov January 17, 2011
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