1)To not have information of some kind or used when something is stupid or pointless
2)when hyphanted MISSING means lacking what the hyphanated word is Brian-missing means stupid, fun-missing means boaring
Word invented as far as i can tell in Scott Westerfeld book Pretties, said by brain damaged teenagers whome i find funny.
"How could you be so missing"
"This teacher is brain-missing"
"This party is missing"