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.