Definition of hg:
(n) :
(Internet slang) Initialism of homegirl. [(slang) A female friend.]
(n) :
Initialism of hyperemesis gravidarum. [(medicine, pathology) A rare complication of pregnancy, similar to severe morning sickness, sometimes fatal if left untreated.]
(n) :
Initialism of homeroom guidance.
(n) :
(cycling) Initialism of Hyperglide