see a man about a dog

see a man about a dog

To leave somewhere without explaining where one is going. The phrase is usually used as part of an obvious euphemism for going to the bathroom or going to get an alcoholic drink. And that's why quantum physics is a hoax. Now, if you'll excuse me, I need to go see a man about a dog.
See also: dog, man, see
Farlex Dictionary of Idioms.

see a man about a dog

Fig. to leave for some unmentioned purpose. (Often refers to going to the rest room.) I don't know where Tom went. He said he had to see a man about a dog. When John said he was going to see a man about a dog, I thought he would be gone for only a minute.
See also: dog, man, see
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

see a man about a dog

Excuse oneself without giving the real reason for leaving, especially to go to the toilet or have an alcoholic drink. For example, Excuse me, I have to see a man about a dog. This euphemistic term dates from the Prohibition days of the 1920s, when buying liquor was illegal, and, after repeal, was transferred to other circumstances.
See also: dog, man, see
The American Heritage® Dictionary of Idioms by Christine Ammer.

see a man about a dog

used euphemistically when leaving to go to the lavatory or if you do not wish to disclose the nature of the errand you are about to undertake. humorous
See also: dog, man, see
Farlex Partner Idioms Dictionary

see a man about a dog

tv. to leave a place for a mysterious reason, usually to go to the toilet. Fred went to see a man about a dog. I hope he remembers to put the seat down.
See also: dog, man, see
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • go see a man about a dog
  • go to see a man about a dog
  • going to see Mrs. Murphy
  • Everything’s going to be okay
  • everything's going to be OK
  • going, going, gone
  • going, going, gone!
  • go for (something)
  • go for it
  • got