"Memnun oldum. Hoşça kalın."
Translation:Nice to meet you. Bye.
Güle güle is said to someone leaving BY THE PERSON STAYING. It means "smilingly/laughingly/happily" and is short for "Güle güle gidin" -- so it's like saying "Go forth from here happily!"
Hoşça kal(ın) is maybe slightly more often said by the person who leaves (not a hard rule, though--can be said on the phone, or when two people part, or even by the person staying). It means "Stay nicely/well."
the literal translation of "memnun oldum" is ; I became pleased oldum = became
From what I know, hoşça kalin is the formal and more polite way of saying good bye and hoşça kal is the informal.
Hey ich bin deutsch türkin ich finde diese app richtig aber aber nich das alles auf englich ist^
we went to turkey for two years but that was about 7 years ago but i forgot most of the language, i dont ever remember that phrase