go see a man about a dog
go 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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.