n. an ugly (young) woman. (Collegiate.) : What a skank she is! Give her a comb or something.
in. to appear ugly. : Both sisters skank. Must be hereditary.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
skank
"unattractive woman," 1970s, from skag in this sense (1920s), of unknown origin. Meaning "dance to reggae music" is 1976, probably not the same word, but also of unknown origin.
[skangk] 
