for heaven's sake

exclamation2

1. •
   (euphemistic) Expresses frustration, exasperation, annoyance, or the urgency of an instruction.

   • Don't ever use the hood on your anorak; and, if you do, for heaven's sake don't pull the string tight so that you peep out like a little baby in a siren suit. — 1980
2. •
   (euphemistic) Expresses surprise, sometimes pleasant.

   • Well, for heaven's sake! Look who's here! Good to see you again!