a term used on someone who acts as if age doesn't count, acts like a complete idiot, feel they are invincible and feel alchohol or drugs do not affect them badly.
"Check her out she's runnin about with a disney princess umbrella and smoking a joint she's a pure spacky diva"
when someone does something embarassing or stuiped, a person can be spacky if they act like a complete berk! (usually when refering to a person it is a "spackster")