搖頭擺尾 [ㄧㄠˊ ㄊㄡˊ ㄅㄞˇ ㄨㄟˇ; yao2 tou2 bai3 wei3] to nod one's head and wag one's tail (idiom) to be well pleased with oneself to have a lighthearted air ◄ ►