Definitions of flop:

• noun:   the act of throwing yourself down

  Example: "He landed on the bed with a great flop"

• noun:   a complete failure

  Example: "The play was a dismal flop"

• noun:   someone who is unsuccessful
• noun:   an arithmetic operation performed on floating-point numbers

  Example: "This computer can perform a million flops per second"

• verb:   fall suddenly and abruptly
• verb:   fall loosely

  Example: "He flopped into a chair"

• verb:   fail utterly; collapse
• adverb:   with a flopping sound

  Example: "He tumbled flop into the mud"

• adverb:   exactly

  Example: "He fell flop on his face"