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1.
Narcissistic self-reference that an online contributor can use to signify that he or she has reached the hundredth-post marker of Urban Dictionary submissions.

(A compound of CENTenary (or CENTennial number) + senSATION. ;)

.
-- "That's it! U.D. published submission Number One Hundred of mine!" -- "You've reached your centenary on that count. Now you've become a centsation in your own mind, haven't you?"
by al-in-chgo June 23, 2010