Combination of 'decade' and 'hence' - the act of looking back at life 10 years hence and wondering why you did all the depraved things that seemed perfectly normal then.
Older and more mature now, we sat around the bonfire and laughed our heads off as we dived nostalgically into the decadence of 1999.
An A Cappella group at UC Berkeley that sets the standard for current co-ed A Capella groups across the nation.
Man:"Wow, that A Cappella group was great! Who are they?"
Woman:"Oh, that's DeCadence!"
Man:"WOW! They must be the greatest A Cappella group around!"
Woman:" Yes! Of course they are!"