Throw up your hands/arms in despair, horror, etc. - Idioms by The Free Dictionary
throw up your hands/arms in despair, horror, etc.
throw up (one's) hands in despair
To indicate one's unwilling and despairing submission to or acceptance of something. We threw up our hands in despair after they told us that our appointment had been rescheduled again for a third time. All you can do is throw your arms up in despair at the way the government is being run these days.
throw up your hands/arms in deˈspair, ˈhorror, etc. (often humorous) show that you disagree strongly with something, or are very worried about something: When she said she wanted to get a motorbike, her parents threw up their hands in horror.