Ordering at a kopitiam is its own language. Kopi comes with condensed milk unless you say otherwise. O means no milk. C means evaporated milk. Kosong means no sugar, siew dai less, ka dai more. Gau is strong, poh is light, peng is iced, and bungkus or tapau means takeaway.
Kopi Code lets you build a drink and shows how a regular would say it. Then the quiz flips it around: we say the order, you pick what it means.
Lingo varies a little from shop to shop. If your uncle says it differently, tell us in the comments and we will add it.