The kipper's knickers is actually one of a set of nonsense catchphrases from 1920's America. It indicates something excellent, admirable or first-rate - NOT a female who's personal hygeine is in question as posted by iamamanufan on this site.
by The kippers knickers March 9, 2017
Get the kipper's knickersmug. by iamamanufan January 12, 2011
Get the Kipper Knickersmug.