Busey's Pucies is the increasingly popular colloquialism found in the mid-south for dried, caked condiment (e.g. mustard) around the rim of the bottle, generally found at a low end breakfast joint.
Oh god! Switch that mustard out with one from a different table. That is some festering Busey's Pucies growing on there--I don't want to look at it, but I guess that's the price you pay for eating at waffle house.