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