A word that should be removed from the dictionary.
Something exists, but if no one believes it does, then it does not, even if it's actually there.
Something does not exist, but people believe it does, so then it does, even if they can't prove its existance.
Something worthy of positive acknowledgement is said to exist.
Synonyms: rule, kick ass
"This steak burrito totally exists."
"Man, the new Donnas album does NOT exist."