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When you know how to personally contact an expert in a particular field--especially when the subject is unusual, strangely specific, or illegal. Often used when you do not want to reveal the identity of the contact or how you came to make the acquitance of such a person.
Co-worker: "The boss said a hooker took off with the USB flash drive with all our vital code stuck up her vagina. How are we going to find her and get it back?"

You (not wanting to talk about how you did IT for a pimp/gynecologist who owes you a favor): "I know a guy."
by General Deviance June 28, 2018
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2
1. A phrase to use as an excuse when you would rather not explain how you acquired something.

2. A phrase to calm your friend down after he/she has done something wrong and is looking for some help.
1. Jimmy: Dude, where did you get that gallon of PCP?

John: I know a guy.

2. Jenny: Oh my god, I'm pregnant! What the fuck am I gonna do?!?!

Jillian: Chill out, I know a guy.
by furrymonkey March 02, 2010
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