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1.
A word used to describes one's tendency to avoid purchasing and/or reciprocating in any or all activities in a social setting involving friends or new acquaintances.

Other traits in someone suspected of being "Gillish" is an over confidence, a know it all mentality and a sense of I am right more times than wrong.
Who's round is it? Guess? We'll be lucky if actually offers without being asked. He's being Gillish again........
by B4TM4N March 01, 2011
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