a philosophy to live a clean, responsible and sober lifestyle; a choice that many, many people consciously make, except being "straight-edge" is an excuse to put X's all over yourself as well as before and after everything you write, to use a label to make your choices look better than everyone else's and belong to a clique.
Dave: "what's the difference between you and XStevenX - that straight-edge guy?"
Me: "well, both of us choose to live a substance-free and responsible life, except XStevenX is self-righteous, insecure douche-bag who needs desperately wants to be a part of another
cliche clique, a needs a pathetic label to advertise his "morals" as being above everyone else's."