Chill, son . Most teenagers understand it. But if you are an adult or ESOL 1 or 2 student, you might be completely lost. No, I don't understand that conversation at all. New slang words are being invented by teenagers always.
Teens use slang words in sentences to make the sentences shorter, faster and easier to say.
Those slang words are used in different ways and have different meanings from the literal or dictionary meaning. Adult language and teen language are different. Teens slang helps them identify with a group. Everyone says it because they usually hear everybody say it.