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1.
To indirectly tell secrets or offenses to a person of authority or any person meant to be kept away from a secret or offense, sometimes inadvertently.
If the telling of secrets or offenses is purposeful, minute details are usually left out as not to appear to be directly telling.

It is indirectly snitching.

"I see this offensive picture is still up. I recall other member's being banned for posting such a thing."
"I see this offensive picture is still up. I recall other member's being banned for posting such a thing."

This person is dry snitching on the person that posted the offensive picture. The person is not directly named (a minute detail) and a direct action is not actually being suggested.

"Stop dry snitching. You are going to get him banned"
by Busyman October 03, 2005
 
2.
Indirectly telling an authority figure or interested person who might have been involved in the incident the authority figure or interested person is curious about. It's not "pointing the finger" but more or less telling them as if they already know or as if they are clue less.
On the phone with your "bro" while you're in jail and your "bro" says, "DUDE! I can't believe you did that! Remember that time when you shot that gun on 19th ave?" That is called DRY SNITCHING!
by CorruptedTheKarupt May 28, 2011
 
3.
To explain how something works that, by nature, is not supposed to be explained but rather understood or experienced. A practice most commonly used in a number of rap lyrics. Basically tellin on yourself and others while trying to show out or look cool.
ex #1 "I can go to _______ and get you _______ for about $_______... but don't tell nobody."

ex #2- "If you got what I need then set it up. I don't wanna hear about. Don't tell me nothin except when you can get me what what I need and what you need in return because otherwise you are guilty of DRY SNITCHING!"
by Mr. Hood Regulator June 26, 2007