a youth who spends a great deal of time at a hockey rink, helping with maintenance work, sweeping, etc., often without pay or in return for free admission to the rink.
Origin of rink rat
First recorded in 1940–45
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Canadian informal a young person who carries out chores at an ice-hockey rink in return for free skating time
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012