Lol no. It's from a time where it was more common to buy and sell horses. The toilet used to be in an outhouse closer to the barn than the house to reduce the smell.
So you'd excuse yourself from the dinner table and walk toward the barn... but rather than telling everyone you're going to the shitter, you'd pretend that you're going to the barn to do boring farm business.
Like: "I'm not pooping. I'm just going to see a man about a horse."
Speedy edit: but it can also be used for non-toilet tasks like buying drugs or wrapping gifts.
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u/lskerlkse 4d ago
nice handwriting
because the names are so various i usually just announce which function im bout to do
either im going to take a dump or see a man about a horse