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