他哼着'嘟嘟嘟嘟'的调子走来走去。

He walked around humming '___doo-doo-doo-doo' to himself.

别太认真啦，那不过是些无聊的闲话罢了。

Don't take it seriously, it's just some ___doo-doo-doo-doo gossip.