Top Definition
A grossly overweight and lazy person, especially a female. characteristics include eating non-stop, refusing physical exercise and general laziness. originates from the two words mujer (spanish for woman) and container, literally meaning half woman half container.
cristina solidified her status as the biggest mujainer by inhaling her third burger while watching t.v. for a record fifteenth straight hour.
by jeff_toronto January 07, 2009

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