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A Plym is a university aged girl that possesses a huge personality, most likely including many feisty traits. Plym's tend to be small, dark haired and are more often than not wearing a heel (better used to fight with). however Plym's do have nice streaks that are normally apparent if the Plym in question likes you. Overall being on good terms with a Plym is a valuable asset.
In dialect -

Boy 1 - have you heard about that girl on the fifth floor?
Boy 2 - yeah, i hear she's a right Plym.
by MJMSNZ September 08, 2011
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