Jiffytard Share definition Flag Noun - Any of the low level, high school drop-outs at your local Jiffy Lube. You know, the ones who never went on to anything else. That Jiffytard better not fuck up my car. Jiffytard by myaj April 25, 2011 0 0 Get merch Get the Jiffytard mug. Buy Now — $32.95 See more merch