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A friendship that is so awesome it lasts a decade. A friendship where you can say a random sentence that makes absolutely no sense and the friend will understand it and take it as a codeword for something instead of nothing at all.
the only thing that can break a decadeship is death.
'We've been friends for over 10 years, we're like the superior ultimo of cheesy superior friendship.'

'We've made ourselves a decadeship.'
by Minimoose the oracle. March 31, 2014
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