A golf ball that does not conform to USGA and/or R&A guidelines for competitive use. This term is derived from the phrase "non-conforming".
Such balls are generally slightly smaller and heavier than ordinary balls approved for tournament play, allowing them to fly farther than their counterparts under comparable conditions.
Dude, did you see little Johnny's tee shot? He just drove the *&^%$# greenside bunker on that 480-yard Par 4!
Check his ball, he must be playing a non-con.
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