闹着玩儿[nào zhe wánr]
词典joke：笑话，玩笑；笑柄，笑料。
词典horse around：鬼混；闹哄；<美俚>胡闹；玩弄。
joke; horse around:
例：他是跟你闹着玩儿的， 你别当真。
He was joking. Don't take it seriously.
这可不是闹着玩儿的事。
This is no joking matter.; This is no joke.
那是一些孩子在闹着玩儿。
It's just some kids horsing around.