Phrase invented in the early 1900s that merely means that you have to use the restroom. Some also use it because they do not want to reveal the true nature of their business.
Where are you going?" "I'm going to see a man about a dog, I've been holding it all day!
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Shortened version of "Okay."
Although, presently, it's used for showing the other person you are not interested in the conversation anymore.
"Yeah, I went to this awesome cafe today. I'm going to have to go again sometime."
"K"
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