When you realize you aren't as smart, pretty or rich as another girl. You basically don't have the goods to get anything in life because you are facially bankrupt as well as financially and have had a hard life.
You lack the responsibility or brains and beauty to get ahead and realize you're a 24 year old single mom with nothing going for you but a crack habit.
Sarah was angry about never getting the male attention. She got so angry about being a failure in life that she had to come on urban dictionary to hate on a girl.
She had nothing in her life but put on a front that others are jealous of her to cover up her pathetic life.