Green’s Dictionary of Slang

diarrhoea n.

SE in slang uses

In compounds

diarrhoea bags (n.)

[1980s] (N.Z.) knickerbockers.

diarrhoea clips (n.)

[2000s] (N.Z.) bicycle clips.

diarrhea-mouth (n.)

[1960s+] (US) a very talkative individual.

In phrases

diarrhea of the mouth (n.) (also diarrhea of the jawbone, ...jib, …of speech)

[1940s+] (US) excessive loquacity.