Refers to a resin compound that is refined using shitty pipe or bong residues, combining the words Shatter and After, it's defined as Shafter also because you are basically shafting the rules of comprehension, science, possibility, by recycling often rinsed/lossed cannabis material that accumulates in smoking equipment. Shafter is cristallised and isolated through a simple process, to a resin that is still very, very potent and rich in cannabinoids.
I don't use glass cleaning liquid with my pipe, I take that dark shitty residue and flip it in Shafter