The experience left me with a bitter 'aftertaste'. [=I felt bitter after the experience]
The wine has a smooth/fruity/sweet 'aftertaste'.
(..) have made contact with Le Chiffre. They're going to extract him before dawn. You know, I think I'll call that a Vesper. Because of the bitter aftertaste? No. Because once you've tasted it, that's all you want to drink. -I thought that was quite a good line. -It was a very good line. (..)2006 Casino Royale