Definition of "Flop" :

noun: the act of throwing yourself down

"He landed on the bed with a great flop."

noun: a complete failure

"The play was a dismal flop."

noun: someone who is unsuccessful

noun: an arithmetic operation performed on floating-point numbers

"This computer can perform a million flops per second."

verb: fall suddenly and abruptly

verb: fall loosely

"He flopped into a chair."

verb: fail utterly; collapse

adverb: exactly

"He fell flop on his face."

adverb: with a flopping sound

"He tumbled flop into the mud."