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1.
white, sometimes crusty remnants of post-nasal drip caused by "doing a line" or "some lines" of an illegal substance such as cocaine or methaphetamine (speed). Possession of any of these illegal drugs is classified as a felony. These remnants will often form ring(s) in the opening of the nasal passages.
Felony Ring(s)
Those felony ring(s) are going to get you fired!

I know what he had for lunch. Look at those felony ring(s).

Always check your nose in the mirror for felony ring(s) after lunch.
by G's Spot November 17, 2005
 
2.
the residue that forms around your nostril shortly after snorting illegal substances.ie; methamphetamine, cocaine, etc.
Before talking to anyone of authority check your nose for a felony ring.
by Matt's Ruca May 21, 2007
 
3.
visible trace of a recently snorted substance that is in the form of a "ring" at the opening of one's nostril.
Tony Montoya had a felony ring after snorting a bunch of cocaine and saying, "Say hello to my little friend".
by Glynnis Wright March 09, 2007
 
4.
visible trace of a recently snorted substance (which possession of is a felony) that is in the form of a ring at the opening of one's nostril.
Tony Montoya(Scarface)had a felony ring after snorting a bunch of cocaine.
by Glynnis Wright March 13, 2007
 
5.
A circle of powder, ringing the inside of one's nostril which can be left over (or I suppose even BUILD UP) from the ingestion of an illegal drug in powder form by "snorting", or quickly inhaling said powder through a small straw or glass tube (usually known as a "Tooter")inserted directly into a nostril. Most common among cocaine users; however, the term "felony ring" was first coined by meth-amphetamine users, since if the wrong person noticed, it could lead to a felony charge, as the laws are quite strict and harsh for what could be considered MINISCULE amounts of the drug. In essence, a felony ring contains enough of the drug, in weight, for one to be charged with a felony.
(In the same sense as two friends who are running a few quick checks on each other's appearance before going into a packed night club)

"Any felony rings? No? Good- no jail for ME today!"
by fLexicOnartist February 06, 2008