Top definition
(noun)

1. A thing/concept that cannot be defined for a person who doesn't already know/understand what the thing/concept is.

2. A word/concept with a self-serving/redundant definition. (i.e. A word/concept that is defined solely for the purpose of the word/concept existing.)
"I can't tell you what it is unless you know what it is." (In this riddle the word 'it' represents a flibiddajib.)
by Literally Sunday November 13, 2011
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