To fall, move, or hang in a loose, ungainly, or relaxed manner. The fish flopped around on the deck of the boat.
To fail completely, especially in a performance or undertaking. The new play flopped on its opening night.
To drop or plump down suddenly or heavily. He flopped onto the couch after a long day at work.
In sports, to fall deliberately in order to deceive officials into calling a foul. The striker was booked for flopping in the penalty area.