A form of precipitation that is best described as between snow and hail. It can be compared to the shape (and perhaps consistency) of those tiny Styrofoam balls/beads that come with some packaging.
Drock: "Is it hailing out?"
Claytron: "No, but it's not quite snowing either."
Drock: "Its kind of between snow and hail, looks like styrofoam."
Claytron: "Its hucklechuck."
Drock: "I hate when its hucklechuking out, its so slippery!"