Wanker

Angry Kid is sitting in the back of Dad's car and he asks him, "What's a wanker?", because his friends told him what it was like at school. But Dad can't put it in terms Angry Kid would understand, so he just tells him that it's a type of behavior and tells him to not talk about it, to which Angry Kid agrees. He then whispers, "Wanker!" while doing the "Wanker" gesture.