Pantywaist is a derogatory term used to describe someone who is weak or cowardly. It is often used to describe someone who is overly sensitive or timid. The term can be broken down into three parts: WUSS (4 letters), SISSY (5 letters), and WIMP (4 letters). WUSS stands for weak, SISSY stands for effeminate, and WIMP stands for timid. Together, these words form the term pantywaist, which is used to describe someone who is weak, effeminate, and timid.