fling (one's) hands up(redirected from fling his hands up)
fling (one's) hands up
To toss or jerk one's hands upward, typically to convey some emotion. As the kids ran around the room shrieking, Mom just flung her hands up and shook her head. I can't hear what they're saying, but it looks like Dad just flung his hands up in anger, so that's not a good sign.