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The underwear of a woman of 'loose values' and poor hygeine. A whores knickers. A smelly flange.
"I say Jeeves, I took Miss Kerrington home last night for a bit of 'hows your father' only to discover she was wearing tuna pants and had a very smelly minge"

On addressing a slut: "Oi, Tuna Pants!"
by DougieT May 26, 2006
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