A strike with the hand, usually the palm, against the back of someone's head. It is used to get the attention of the victim, especially for disciplinary purposes.\r\nWhen properly executed, a brain duster causes no damage and little to no lasting pain, but does immediately capture the target's attention.\n> The boy was throwing a tantrum in the middle of the grocery store, so his mother gave him a brain duster and told him to behave.\n