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From the word manky (adj)
To either mess something up or see/do something very disgusting and gross.
Reaching out and putting your hand in a big pile of sticky goo, would be described as manked
by Maxine* May 25, 2004
to be high off your ass.
yo i got so manked the other night with evan and travis off that good gook.
by shannyXapple November 27, 2009
To destroy something. See Men.
Owww I manked my foot!
by Cameron September 04, 2003