--noun-- An action in which one challenges one's own capabilities by smoking a "quad" (1/4 of an ounce of weed, 7 grams) in a short period of time.
Guy 1: I'm not doing anything until 12 tomorrow.
Guy 2: Good, pass the bong. That gives us 6 solid hours of q-icide.
Guy 1: What's wrong with James?
Guy 2: He just smoked a quad of shwag. Straight committed q-icide on himself.