yesterdecade Share definition Flag A portmanteau of the words "yesterday" and "decade", it is defined as the previous decade. If the 80s was considered a yesterdecade, that makes the 90s the current decade. yesterdecade by CrazyChristopher1989 March 12, 2019 0 0 Get merch Get the yesterdecade mug. Buy Now — $32.95 See more merch
