Grand Mom. One's mother or father's mother. Alternative name for Grandmother, usually for a young, stylish, or sexy Grandma.
My child calls my mom "G-Mom" because it sounds younger than Grandmother or Grandma.
by FabulousVelouria February 22, 2015
Any kind of fuck-able mother in which you would do "dirty" sexual things to such as: the rusty bean, the steamed burito, burning ham booty call etc.
Man that chick was a total G mom
by Dg1234 March 27, 2010