jam-o-meter Share definition Flag A fictional device that actually measures how jammed up someone is. The jam-o-meter is on a scale from 1 to 11. Keith sure appears fired up today. I bet he's at least an 8 on the jam-o-meter. jam-o-meter by Nexter Level April 22, 2009 0 0 Get merch Get the jam-o-meter mug. Buy Now — $32.95 See more merch