(slang, idiomatic, euphemistic) A message signaling one needs to use the toilet.
Origin of See-a-man-about-a-horse
The saying comes from the 1866 Dion Boucicault play, Flying Scud, in which a character knowingly breezes past a difficult situation saying, "Excuse me Mr. Quail, I can't stop; I've got to see a man about a dog."
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