馬うまの骨ほね

expression, noun

person of doubtful origin; nobody

Derogatory set phrase used to dismiss someone as having no respectable background or credentials. Often appears in the pattern どこの馬の骨ともわからない (some nobody from who-knows-where).

• どこの馬うまの骨ほねともわからない男おとこに娘むすめをやれるか。

  How could I give my daughter to some nobody from who-knows-where?

• 彼かれは「あんな馬うまの骨ほねに任まかせられるか」と怒おこった。

  He got angry, saying, 'How could we leave it to a nobody like that?'