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Uncoolness Leak 

When somebody who always tries to maintain a high level of coolness / hipsterness on Facebook is tagged in a ridiculous image or status by an old friend or family member, which makes them ashamed and destroys their Facebook 'image'.

This also happens when one of their family members comments on one of their photos with something retarded.
Have you seen how Poppy's older sister has commented on literally every one of her photos? What an Uncoolness Leak, man.
Uncoolness Leak by AgentB August 27, 2011
Related Words

unconess 

to fall over, stumble, trip constantly
Dani is filled with so much unconess
unconess by Dani September 28, 2003