What is meth?

Technical: Methamphetamine is a benzylamine with a methyl group attached to the nitrogen atom. Benzylamines, as a class of molecule, are psychoactive and under strict legal control. (Forgive me, I am by education a chemist.)

Practical: Meth is to modern Whites in suburbs and rural areas what crack cocaine was to 1980's Blacks in urban areas: a cheap, readily available, easily manufactured, and intensely addictive drug particularly good at creating massive legions of burn-outs who only sustain themselves through crime.

Also, it makes teeth look like this: