Combination of Keif and reefer. Used among well informed potheads to refer to dank that gets its power from the the crystals/orange hairs/and fine resin particles (keif)that come off a kind
bud. When smoked a very very intense high will ensue.
Not to be confused with Keith, which is a really fat
joint, though the term probably originated from
people somehow misusing Keith for Keif.