mod. alcohol intoxicated. : George is just a little muggy. It doesn't take much anymore.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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1731, from mugen "to drizzle" (c.1390), from O.N. mugga "drizzle, mist," related to mjukr "soft," or O.N. mygla "mold," which is cognate with L. mucus "snot."