Slang is the word that often been used in the teenager conversation, which is not official, but most of the people still could understand what you are saying. For example, lol, idk and sry. These are the words that people use on the internet, because it’s more convenient for typing. There’s also some words that are official, but they have the different meaning when they are slang. Ace used to means the “A”, the highest card in the poker, and now it means excellent or very good, in none it use as genius or master. For example: “ Mark can easily sing these high notes, he is ace!” It means that Mark is a master of singing. Because the slang’s meaning is too common, it is almost official now. “ Awesome” is the word that we used when we are feeling good or think something is amazing, for example: “ I went to the prom last night, I had fun with everyone there, it was awesome!” but in the official meaning, awesome means august, it is an adjective of awe! That is weird for me, before I found it on the dictionary, I used to think that great or wonderful is the only meaning of awesome.
I am curious about who created these slang? Slang makes the conversation more interesting, and it represent the culture of the country. Don’t just look the words on the textbook if you are learning an new language, also looks for the slang, it does help.