ooblick /oo'blik/ n.
[from the Dr. Seuss title "Bartholomew and the Oobleck"; the
spelling `oobleck' is still current in the mainstream] A bizarre
semi-liquid sludge made from cornstarch and water. Enjoyed among
hackers who make batches during playtime at parties for its
amusing and extremely non-Newtonian behavior; it pours and
splatters, but resists rapid motion like a solid and will even
crack when hit by a hammer. Often found near lasers.
Here is a field-tested ooblick recipe contributed by GLS: