"Popsicle stick" is a Mopar term for some kind of obstruction mod added to block or direct fuel droplets in a manifold to cure a mixture distribution error - beginning with factory mods for the original manifolds, then the most common aftermarket (based on popularity and success).
A negative popsicle stick is a ditch, just a shallow grind mark leading across a runner entrance (to divert fuel away) or into the runner (to add fuel), both are used in combination depending on the shape, and which one will be easier to add. Some are directly below the throttles, most affect a single runner or pair. The Mopar boards include some diagrams (but of course only appropriate for that motor and manifold).
