ask for the moon

ask after

To enquire about the health or progress (of someone).

ask around

To enquire of different people about something.

ask for it

To provoke an unwanted action; to invite a problem or fail to prevent one.

ask my arse

A common reply to any question; once common at court and among sailors, under the name of "selling bargains".

ask round

To enquire of several people.

blue moon

A long time.

hang the moon

To place the moon in the sky: used as an example of a superlative act attributed to someone viewed with uncritical or excessive awe, reverence, or infatuation.

howl at the moon

To spend considerable time and effort fruitlessly in a hopeless endeavor.