what is a jigger?
1 Jigger (bartending) the tool used to measure out a jigger. 2  Jigger, a machine for the shaping of clay body into flatware by the differential rotation of a profile tool and mould.3  Chigoe flea, a tropical parasitic arthropod found that can cause an inflammatory skin disease.igger may refer to: 1  Handcar, a hand-operated railway car, mostly used for maintenance. 2  Jigger (unit) , a measure of alcoholic beverage ingredients. 3  Jigger (bartending) the tool used to measure out a jigger.