Top Definition
Horse Gum Syndrome also referred to as HGS, is a condition pertaining to both male and female homosapiens in which their gums are overexposed when he or she smiles. Usually considered an unattractive trait.
11 out of 11 Dentists recommend that people inflicted with Horse Gum Syndrome (HGS) floss 5 times a day to prevent gum disease.
by Craig Schreiber February 08, 2008

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