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A Coal Mine is an insult from a friend or family member that uses an embarassing or deep secret of your's to hurt or embarass you. Usually used in a large crowd (where it has more exposure to others.) or to use against you.
1. Bill doesn't have a girlfriend anymore because his brother Coal Mined him in front of her.
2. "Hey Bob, get me a drink."
"Why should I?"
"Hmm... Perhaps you've told me something I can Coal Mine you with."
by Buffalo Puppy July 25, 2009
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Aug 11 Word of the Day
You can tell by the way she walks, she got that WAP.

You can look at her face and tell she ain't got that WAP.
by Black Don August 06, 2020
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2
Euphemism for rectum or anus, specifically when referring to anal sex.
I went out with Jill last weekend and I stuck it in her coal-mine.
by Pook420 April 28, 2009
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