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1.
A word originated from the norwegian word måke (sea gull), used to describe a person in a degrading fashion.

Derived from trøndelag in the north of norway.
Måsi sigri, thats what you are.
by Soundtechie May 26, 2010
 
2.
A small, ignorant animal having many of the same qualities as a weasel or feret.

Core belief: In order to achieve greater power, one must take it in the ass on a daily basis....

This is a VERY powerful animal.
"Amsterdam holds mystical powers of that Masi, based on the goofy animals core beliefs."
by Ronny Benson August 31, 2006