A very small owl that appears spherical when it's feathers are fluffed up against cold weather, or when annoyed.
by Moto42 February 25, 2009
1. noun: A ball of marijuana resin mixed with stems, bits of bud, and/or shake, the end product resembling an "owl ball" (the gastric leavings of owls: digestive matter mixed with ends of rodent bones, etc).
1. "If we mix some stem ends and a little bit of shake with this ball of resin, we'll have an owl ball."
by thespecter October 5, 2007