こどものつかい
useless messenger; doing only as one is told; fool's errand
Also written 子どもの使い
Expression, Noun
子供こどもの使つかいじゃあるまいし、もうちょいとまともな交渉こうしょうしてくれんかね。
What are you, just an errand boy? Start thinking for yourself and give me something serious to work with.