你是问 Mother Hubbard?
这不是俚语,只是一个英美人用来取代某些字或不表达任何意义的谐音.
Mother Hubbard 出自儿童谐音歌谣“Old Mother Hubbard”:
Old Mother Hubbard
Went to the cupboard,
To give the poor dog a bone;
When she came there,
The cupboard was bare,
And so the poor dog had none.
.
听上去你问的句子是用 Mother Hubbard 来取代一个不雅字眼 You mother f_ _ _ _ _.