fling up (one's) arms in (some emotion)(redirected from fling up their arms in)
fling up (one's) arms 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 up her arms in exhaustion and shook her head. I can't hear what they're saying, but it looks like Dad just flung up his arms in anger, so that's not a good sign.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.