Used to refer to MDMA, but now refers to a variety of MDxx chemicals combined with a low dose of 2C-I(although not to all MDxx). Molly refers to MDxx which turns purple during a Marquis regent test. The low dose of 2C-I is usually added because 2C-I's a strong clean safe stimulant at low doses (usually because with the exception of MDMA, all MDxx class of compounds have less stimulant effects). Molly has euphoric effects that affects norepinephrine, serotonin, and dopamine. It's usually found in the form of crystals, in ecstasy pills, and in powdered form in capsules. Molly and safrole are becoming rarer and rarer.
Dude 1:Where's the molly.
*ten years later*
Dude 1:Yes! Finally! I finally got the molly! This rave is rolling!