It could also just be English if you only speak English.
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“I have to see a man about a horse.”
It means you’re going to the bathroom.
I’ve always heard this used to mean “I’ve gotta leave quickly” rather than going to bathroom; but I’m British so it might not hold the same meaning of you’re not also!
I’ve heard the size of the animal denotes how long they will take and/or how urgently they need to leave.
Brb, I gotta go take a Brontosaurus.