'Going to see a man about a dog' is an often used a euphemism in Great Britain. It is most often used when telling someone you are going to the toilet. It has also been used to describe meeting a woman for sex i.e - when you replace the 'man' and 'dog' in the sentence with their opposites 'woman' and 'cat' (but in this case we use another word meaning cat, 'pussy') so you end up with 'going to see a woman about a pussy.'
'Where you off too?' 'Going to see a man about a dog.'

'Where you rushing off too so fast?' *Man Winks* 'Going to see a man about a dog'
by KDottDizz August 16, 2009
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Going to see the "man" to buy something that is possibly illegal.
Going to pick up your supply, supply of whatever it is you require. or just See a man about a dog
I'm just going to see a man about a dog, then we can pipe it up and watch the movie.
by XXXX May 2, 2003
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Slang used while referring to going to have a drink down the pub.

Most commonly used in the North East of England. Due to it being originally derived from people who drink/drank the ex-Newcastle brewed alchohol, Newcastle Brown Ale.

The sentance itself is actually printed on the label of the newer bottles of Newcastle Brown.
Fred: Doing anything decent this weekend?

Bob: Going to see a man about a dog on friday if you fancy coming?
by iMikey February 10, 2010
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Something you say when you are leaving in order to conceal your true purpose for leaving especially if you are going to see your drug dealer or going to get high.
Me: Where you going, Brian?
Brian: I'm going to see a man about a horse.
Joe: Hide the snacks...He's gonna have the munchies when he gets back!
Me: Yeah...You wanna go to the bar?
Joe: Yeah
by Open Side September 21, 2009
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An idiom or a figure of speech that conceals where you are truly going and what you are really going to do. In all honesty, you are sending the message that you are heading for the toilet to lay waste in. This phrase is derived from a much similar phrase, does a bear crap in the woods?, which is a question that is posed after someone states the obvious.

See Going to see a man about a dog and Going to see a man about a horse for similar phrases.
"I'll be right back. I'm going to see a man about a bear in the woods."
by AngelMekk April 13, 2019
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A reference to a classic book published in 1937. In the book one of the main characters, "Lennie" murders a women by mistake because he had a mental disorder and she was trying to seduce him into doing sexual acts with her... its alot to explain.

tldr: She told Lennie to grab her hair, he grabbed too tight, she screamed to let go, he paniced and killed her. So Lennies best friend, (another main character) George took Lennie to go see the rabbits i a forest by a body of water so Lennie could be in a happy place before George shot him in the back of the head because he was worried Lennie would panic and kill another person and get in even more trouble.

To "Go See The Rabbits" yourself or to take someone else to "Go See The Rabbits" could be subtly refering to suicide, putting down a pet, or murder.
Example #1:

Random Guy: "Life hasnt been going too well... maybe i should go see the rabbits"

Example #2 (i wouldn't do this... sounds kinda fucked up):

"Maybe i should go take (pet name) to go see the rabbits. he/she's getting very sick/old"

Example #3:

"If you dont shut up im gonna go take you to see the rabbits!"
by You Fucking Moron February 9, 2022
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