A gopping vagina, one that smells after a night out, or due to a lack of feminine hygiene. a disco fanny. Also a term used when something in general is disgusting, horrid and vile.
"That girls skirt is so short I can see her baggy slonge"
Girl 1- "Have you just opened a tin of cat food?"
Girl 2- "No that's my Gopping Slonge"
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