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When a girl is checking out a guy, oftentimes as a double-take or lookback.

There is much debate over the origin of the term; however, popular sources concur that it may have originated as a phonetically similar juxtaposition to the phrase "hairy glower."
Damn, Phil! That hottie over there is giving you the gary towers. You should go spit some game.
by The Goron August 08, 2008