拍腦瓜 pāinǎoguā to act on a whim Origin Definitions Defs Strokes Stroke Words Sentences Sents 拍 pāi verb to pat to pat; to clap; to slap; to swat with the palm of the hand or a flat object脑瓜 腦瓜 nǎoguā head; brains (informal) the head; skull; brains; mind; mentality