Top Definition
The long-term girl friend of your future boyfriend. She is generally of moderate attractiveness, intelligence and wit; somewhat 'sporty' and more or less liked by all his friends. Little do they know she is a gummy, boyfriend stealing little twat (see df: twat).

Historical note: original specimens were often found to have prominent orthodontic flaws, giving rise to the use of 'gum'
'Tom's girlfriend is so sweet, I just love her!'

'Yeah....(under one's breath) I hate that gummy bitch'
by Jealous Virgin October 18, 2011

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