gym rat gym mat • gym shoe · · · Info · Definitions · Characters · · gym rat · · Text Common · · Latin · · Scripts 7 · · Length 2 · · Syllables Definitions · · · (noun) someone who spends all leisure time playing sports or working out in a gymnasium or health spa. Synonyms: gym rat. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 g latin small letter g U+0067 m latin small letter m U+006D r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079