a) To make a sudden and unplanned movement, a twitch, usually caused by being so stoned u just flinch for no reason and the person sat next to u thinks ur weird.
b) When you have consumed too many drugs/too much alcohol and u blackout on the floor and twitch when you are unconcious. (an epileptic fit is also known as a spazz out)
a) Whoa my leg just spazzed out, Im so stoned.
b) I dont think I should hav...smack, dribble, twitch twitch twitch