I have been trying to use my limited German knowledge, but it is quite difficult to understand the native Basel speakers. They have their own dialect and it does not sound that similar to hochDeutsch (high German). I guess each city has its own dialect. Zurich German sounds weird to people in Basel, even though they live less than an hour away by train.
Morge: shortened form of German saying “morgen”
Merci: Thank you, used more often than Danke
Tageshit: Menu of the Day (or Daily Special)
Schoggi: Chocolate, used instead of the Schokolade
Velo: used for Bike, instead of Fahrrad
Gleis: train platform, Gleis 6 is train platform 6
Grüezi: Greetings, typically said whenever you enter a store
Grüezi Mitenand or Grüezi wohl is also said
Adieu: Goodbye, used sometimes instead of Tschuss or Auf Wiedersehen by locals.