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Explanation: lipstick on a pig:
Slang for when someone tries to dress something up, but is still that something. usually used on ugly broads, when they put on a skirt and some lipstick and well, they still look like the same digusting pig.
"You put lipstick on a pig, it's still a pig"
Το εν λόγω «lipstick» είναι το «σαπούνι» στο («τον αράπη κι αν τον πλένεις το σαπούνι σου χαλάς»... :)