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Australian slang. A matress which someone has munted (vomited) on. Muntress can also include sweat, piss and pool water.
Omg, Em just munted on that matress!
Someone put that muntress outside, it reeks!
An amalgamation between a "munter" (see munter) and a mattress.
Usually a large individual that should know their limits, and comedic for all the wrong reasons.