T.O.M is a definition for a girls period, her "time of month". It's both a way to keep it private, but let others know if it's needed.
Girl 1: "OMG T.O.M came today, I about screamed."
Girl 2: "Oh I'm sorry, hope he doesn't visit me too soon."
Girl 2: "Oh I'm sorry, hope he doesn't visit me too soon."
by Mother Nature's Gift July 19, 2010