im going to see a man about a dog

[orphanides]

what does im going to see a man about a dog mean
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[Postdog]

Well I'd love to know how you get all that gobbledy gook to show up. Seriously, I would.

Anyway, the answer to your question is to go to the toilet. Other than that, I can't shed any light.

[Azimov]

"I'm going to see a man about a dog" means "I have some business to take care of!"

You might also say this if you have to pee, but that would be using the phrase in a more contemporary, inelegant fashion!

[shaneystar2]

And more explanations here in a similar fashion
http://www.worldwidewords.org/qa/qa-see1.htm

[frenchfriar]

"I'm going to see a man about a dog" or "I'm going to go see a man about a horse" have been used in America, at least, to mean, "I have to go place my bet, now." it's a reference to betting on horse or dog races, and the rush is implied; because you have to get to the betting office, before the race begins, to place your bet. From there, it has become a more standard excuse for leaving someone momentarily, with the expectation of returning soon. (hence, a good excuse for grabbing a beer, or using "the facilities", without having to state what one is actually doing.)