The language here is SOOOOOO creative, I love it! It is more than words; often what you hear is a clever version of what is meant. Ingest a variety of print, radio and tv, especially the commercials. Listen to conversations and try to follow the thread. In conversation start using some of the word styles and phrases you hear that are different from yours. Listen to DJ's and dancehall recordings. Ask for translations. I've learned a lot from the bits that people share in their trip reports. Eventually it starts to come together. Thus far I don't speak it but I use phrases and can understand a lot if I can hear it well enough.