This is a web cult / viral video sensation song by The Zuiikin Gals – from Zuiikin’ English

Zuiikin’ English or officially Eikaiwa Taisō Zuiikin’ English (英会話体操 Zuiikin’ English Eikaiwa Taisō Zuiikin Ingurisshu?) is a Japanese television series originally aired in 1992 by Fuji Television. The series combines English language lessons with gymnastic exercise programs. The series consists of 24 episodes.

This song is from the final episode in which three English native speakers demonstrated gymnastic movements while chanting supposedly useful Japanese phrases which included the statement “I Have A Bad Case of Diarrhea”.