1. A sac (
bag) of any kind. Could be a backpack, a purse, a plastic
bag, a
bag for testicles, or any kind of
bag/device that holds stuff. See example #1.
2. Loosely used to describe anything. Also used as a suffix for one's name by a small, cultish group of linguists residing in the nation's capital. See example #2.
3. Inserted innocuously into sentences as a substitute for words rhyming with it. See example #3.