Definitions
1.verbTo alter or adjust, particularly in ways not originally intended."You'll have to jigger it from the original specifications to get it to work."
2.verbTo use a jigger.
3.verbTo move, send, or drive with a jerk; to jerk; also, to drive or send over with a jerk, as a golf ball.
4.verbTo imprison.
5.verbTo confound; to damn.
6.adjectiveVery tired.
7.adjectiveBroken.
8.adjectiveDamned, in the sense of "I'll be damned if...", expressing utter certainty.