'Group-chat approval' is the joking-but-real practice of running important decisions — what to wear, whether to text someone back, whether to break up — past your closest friends in a group chat before acting. Among Gen Z and Millennials it is a recognised modern decision-making ritual. If your teen says 'I need group-chat approval', they are consulting their friends. Wholesome sign of strong friendships; only worth attention if a friend group is steering harmful decisions.