Let's compile a list of common Slang words/terms for non-native speakers.

I am going to be teaching English in Malang in July and have been studying the language via text and online methods for a few weeks, and will continue to do so up until my arrival. I hear that though I may be able to communicate, I will not be able to follow along with conversation due to the high volume of slang terms being used. Any help with some slang or jargon terms would be very helpful!