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This Urban Dictionary rubber stamp refers to the phenomenon that even the most ridiculously stupid definitions get approved.
Chi Chi: Can you believe that captain iridium got approved?

Jr: I know! It's so stupid, because osmium is the densest element, not iridium. It's the most pathetic attempt at a joke ever.

Chi Chi: That's the Urban Dictionary rubber stamp for you...
by moraleboatanchor April 27, 2013