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1.
A term of derision used to describe one who has lived in Perth, Western Australia their whole life, and who, upon hitting their mid-twenties, suddenly decides to move to Melbourne, where they will mostly hang out with other moosers.
Gawain Davies is such a mooser.
by cli-cli February 18, 2004
 
2.
a fart that lasts 5 seconds long
Bond just let go a mooser
by gorak April 08, 2003