Slang, either good or bad, is widely used by English speakers, but especially in America. These are simply a few examples of some commonly-used slang terms/phrases. I'm sure that you each already know some of these slang phrases and expressions.
It is important to understand that, in much of America, words ending in -ing are often pronounced without the "g". So, "going" would be pronounced more like "go-in" and "running" would be pronounced more like "run-in". In spelling, this is abbreviated by using -in' . So, "going" would be written " goin' " and "running" would be written as " runnin' ". This phonological phenomenon is present in many parts of America but especially in urban areas and the southern parts of the U.S.A. Remember, this usage is improper and should not be used unless you are speaking to friends/family, or if you are in an informal place.
This list is not complete, but it is a start. Again, I don't know how much of these that you already know. If you already know a lot of these, then just tell me, and next time I will think of some stranger slang phrases/expressions. And of course, feel free to add any that you can think of!
Hey Caleb, great list you have there! I'm from Georgia, one of the southern states and I have to admit WE DO USE a lot of slang. Sometimes we use it so often we don't realize it's actually improper and informal to use when speaking professionally towards your supervisor. So reading the list was a great refresher for me - thank you.
Let me also add one more thing on your list:
ya'll = you all (this is used a lot in the south)
Example sentence: What are ya'll doin here? ;)