I took a look into his marathon times, and when he sped up from 7 minutes per mile in the first half of the race to 5 minutes per mile for the second half of the race, it was very clear he kipped the course. The race director did disqualify.
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.