Top Definition
A person who contributes little or nothing to a given situation. Although you find galleywackers everywhere those in the workplace are the most annoying because they are likely receiving the same or greater rewards while doing little of the actual work.
Jeff was exactly right when he said the Roberts crew was a bunch of galleywackers.

That galleywacker DJ left me all his work to do.
by Little Buddy Squarepants February 24, 2014

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