flop into

flop into (something)

To fling or plop oneself down into something. I knocked a few pillows onto the floor when I flopped into the armchair.
See also: flop
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

flop into something

[for someone] to fall or drop into something, such as bed, a chair, a bathtub, etc. Maggie flopped into the chair and slipped off her shoes. Tom flopped into bed and fell fast asleep.
See also: flop
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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References in classic literature ?
He stooped, and dipped his beak in the pond; he thought it was his beak, but, of course, it was only his nose, and, therefore, very little water came up, and that not so refreshing as usual, so next he tried a puddle, and he fell flop into it.