flop around
To flail or otherwise move around awkwardly. He must be having a nightmare, judging by how he's flopping around in his bed. The fish flopped around on dry land.
flop around
[for something] to turn around awkwardly; [for a fish out of water] to squirm and flap. The hose flopped around, throwing water first this way and then that, knocking down plants as it flopped. A number of fish flopped around in the bottom of the boat.