a portable drill operated by compressed air and used to drill rock, break up pavement, etc.

1925–30, Americanism; jack1 + hammer

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World English Dictionary
jackhammer (ˈdʒækˌhæmə)
a hand-held hammer drill, driven by compressed air, for drilling rocks, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Frequent and prolonged jackhammer use can turn a laborer's fingers white and
They extracted him with a small jackhammer and some ice axes, puncturing his
  hip in the process.
With a rumble loud enough to rival a jackhammer, she broadcasts her
  availability for mating.
She thrashed and twisted on the stretcher as if trying to get out from under a
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