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Has two meanings:
1. Someone with a low level desk-job who relentlessly works 9-5, similar to jobsworth
2. Someone who 'grinds' endlessly on World of Warcraft or any other MMO.
1. "Damn grind monkeys made a huge queue in the post office on their lunch break"

2. "He's playing again? Man he's such a grind moneky"
by Nihilelevant January 13, 2009
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