flop down on
flop down on(to) (something)
1. To fling or plop oneself down onto some surface or thing. I knocked a few pillows onto the floor when I flopped down on the couch. As soon as Paulina flopped down onto the bed with a big sigh, I knew that her date must not have gone well.
2. To plop something down onto some surface or thing. In this usage, a noun or pronoun can be used between "flop" and "down." Once I realized she was angry with me, I flopped her Valentine's present down on the table and left.
flop something down on(to) somethingand flop something down
to drop or slap something down on something. She flopped the liver down on the cutting board. She flopped down the raw meat.