a pile of something considered mildly gross and/or slimy: dirt, earwax, saliva, worms, snails, slugs, moldy bread, seemingly undeserved love and/or affection, innards; things of that nature.
My grandma almost squeezed the grucus outta me, she hugged me that hard!
Noun. Used for dirty, slimy, nasty things. Much like schmutz, it is meant to be a descriptor for something gross on something else that is normally not gross.