1 definition by Shana P

to casually turn your head towards a person of interest, then - with eyebrows raised - quickly and surreptiously (or blatantly, if you want to obvious about it) flick your eyes from their head down to their feet.

basically, checking someone out whether you find them attractive or not.
John gave the girl entering the party the once over.
by Shana P July 31, 2005
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