Gingerbread Leg

To suffer from a mid-run bowel movement .

A mid-run "runner's diarrhea" or "runner's trots" episode

Two famous examples include Catherina McKierna while winning the 1998 London Marathon and more recently Paula Radcliffe while winning the 2005 London Marathon.

"Did you see that guy cross the finish line and just keep running?"

"Yeah, that wasn't a mud puddle he ran through, he had a serious case of Gingerbread Leg."