“vete a la chin***”
Had to look that up. Learn something new everyday...
Spanish is my 2nd language, so I think my saying it in that language has more vulgar emphasis than saying it in English-everybody can say GFY in English-and that Karen knew what I said-either from my accompanying gesture, or because she also speaks Spanish-about 50% of people here do-either way, her look of shock gave me a wicked sense of satisfaction...