G.I.T.M.S.
G. I. T. M. S. means you're so proud of your kid you want to slap them and yell at them at the same time.
Your kid just beat up the school bully. You text them: 'G. I. T. M. S. I'm so proud I might vomit.'
Your kid passed the hardest test ever. You shout in the hallway: 'G. I. T. M. S. I'm gonna die of happiness.'
Your kid won the spelling bee. You send them a DM: 'G. I. T. M. S. I'm gonna cry and laugh at the same time.'