The simple act of being overbearing, distrusting, unnecessarily snarky, nosy, a dumb bitch, a toxic little shit, slightly narcissistic, completely irrational and otherwise a COLOSSAL WANKSTAIN of a parent to your adolescent child for the outstanding reason of:
absolutely nothing. Only used when the child in question has done ZERO total things to warrant the distrust.
"I'd love to participate in <normal teenage activity> but if I do my parent will be leanne-ing for days."