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A Melko is an absolute creep. He or She should never be left unattended with someone of the opposite Gender. One may use Melko to replace such words as creep, pedafile, sex offender or pervert.
That guy was a total Melko, he gave me the creeps.
by Teh_Trooper May 21, 2016
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When a woman performs unwanted sexual acts on a man when he is passed out or on the verge of passing out due to drunkenness or intoxication. Most commonly performed by women who are unattractive or have questionable character.
Guy 1: Bro.. that gross Becca from that party chick totally melkoed me last night.

Guy 2: Dude, Becca melkos everyone! You should get tested..
by t1ger2 September 29, 2010
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