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14.
As said previously, this is an idea mainly thought to be coined by Minor Threat (thus being an offshoot of punk/hardcore).
Their song Straight Edge outlines their lifestyle that they choose to live... I've been told it was their drummer who was using a ruler to draw a poster and noted that the ruler's straight edge was a metaphor for their lifestyles...
The basic outline of straight edge is, as said before, not wanting to or taking part in:
Drinking (or any mind effecting drugs)
Smoking
Casual sex (without a loving relationship)

This is just a simple guideline of what the LIFESTYLE of an edge person is. It can be built upon with vegan/vegetarianism, no caffeine and other choices that keep your body poison free.
An X can be worn on the hands of people who are edge, along with stating poison free, straight edge can be abbreviated to sXe. The X on the hand is because at punk/hardcore gigs, an X was drawn on the hands of minors so that they would not get served at the bar. With this movement people started putting Xs on their hands to show that they did not want to drink.
The idea of straight edge is not to poison the mind and body with anything that is bad for it, this, to me includes being a general bastard to people… For me its being the best person you can be.

We are not boring people, I choose not to drink, it doesn't mean I can’t have fun, or go to parties, I just have fun while knowing what I’m doing and remembering.
Straight edge should unite people and not turn into a gang who discriminate against people who do poison their bodies... It's their choice, let them live with it, I don’t look down on people who aren’t edge.
Two good examples are:
Davey Havok (AFI)
Justin Sane (Anti-flag)
... These guys are modern day saints in my opinion

non sXe: do you want a drink/joint/smoke/one night stand… etc.?
sXe: No thanks, I don’t want to do that
(Straight edge is not a reason not to drink, smoke etc. A straight edge person will have their own reasons; straight edge is just a way of showing their lifestyle.)
by Stef P May 25, 2005
 
1.
Originated from the punkrock/hardcore scene. The philosophy/life-choice that humans should have strength, pride, dignity, honor, and self respect; that they shouldn't engage in activities that are a disgrace to their minds and bodies. (such as ingesting and/or becoming addicted to harmful substances for fun, lying and/or being two-faced, and sharing your body sexually with another person when there isn't even a true emotional bond there)
I'm straight edge you fuck, so no I don't smoke, drink, or do drugs.
by Cryonaut March 28, 2003
 
2.
A board, or piece of wood or metal, having one edge perfectly straight, used to ascertain whether a line is straight or a surface even, and for drawing straight lines.
"Are you straight edge?"
"Did you just call me a fucking ruler?"
by Brian Y. October 15, 2005
 
3.
Straight edge is basically living a clean life without drugs, drinking and casual sex. It's living a poison free and keeping yourself safe. It is a choice and it does not make you better or worse than anyone. We all make choices and some choose to be straight edge and some don't. Yes, it's true that some people will stop being sXe when they turn 21 but that is just another choice. Straight Edge is a way of life but has now been formed into a trend. Out there, there are true edgers.
1)no drugs
2)no alcohol
3)no promiscuous sex
4) Yes, we do have fun
by T December 23, 2003
 
4.
a lifetime commitment never to drink, smoke, or do drugs. some people include abstainence from promiscuous sex. others abstain from caffeine. started in the hardcore/punk scene of the early 1980's in Washington DC.
Earth Crisis are gods of the straightedge movement.
by Lynn February 28, 2005
 
5.
If you're really straight edge, you don't need to go telling everyone about it, it's something you do for YOURSELF. 99% of the morons with X's on their hands are posers/scenesters obsessed with fashioncore.
Example: A lot of the girls on the "girls gone wild" commercials have big black X's on their hand but they're taking off their clothes for cash. How is that respecting their bodies?
by frank zappa March 18, 2005
 
6.
The term originates from a song by "Minor Threat" putting forth the value of a clear mind and a healthy body.

Times as they are, there are now three kinds of sXe'rs.

1. Those who understand what it means. People who value clarity and wish to avoid altered states of perception, poisoning the body, or unsettling the mind. No drugs, some even avoid medicinal drugs as these can alter state of mind. No drinking to excess, as this can alter the mind and poison the body. No promiscuous sex, you got me on this one. These people are, 99% of the time, decent people who see their choices for what they are, choices, nothing more, nothing less.

2. Insecure gits. People who wish to place themselves on a self appointedly superior moral platform, then proceed to brag about how much better they are than everyone else. No drugs. No drink. No Promiscuous sex. No meat. No/very few friends, as few other than those who share their views can stand to be around them for more than ten minutes without driving a lit candle, wick first, into their eye, and injecting them with lighter fluid through the ear.

3. Hardliners. All the stupidity of number two, with knuckledusters. No drugs. No drink. No promiscuous sex. No meat 9 times out of ten. All the clarity with none of the intelligence.
1. I chose not to do drugs, you chose otherwise. *shrugs*

2. Stop poisoning my air you arrogant ignorant smokers!

3. *thwap*
by Stromboli March 08, 2005
 
7.
X No drugs, X no alocohol, and X no casual seX
Im not straight edge to be different. Im straight edge because I know its right. Why do I want to get fucked up and forget all the shit that I did that night? No thanks, I want to enjoy my life by remembering it. Think for yourself.
by Lewis August 12, 2004