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
"He fell flop on his face."
adverb: with a flopping sound
"He tumbled flop into the mud."