Top Definition
Liquid(s) spawned in or collected in a mustache. A water-logged mustache. Mustache water is believed to have Danish origin - (In Danish: "Overskægsvand")

Mustache water is heavily associated with the Mustache splash, a violent release of Mustache water.
When Aaron came back to bed after brushing his teeth, he gave Rebecca a kiss full of refreshing mustache water.

She felt thoroughly mustache splashed.
by Laerin August 10, 2010
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