It is quite impossible to answer a question like this. You will need to ask your friend what he meant.

It may impossible to know what he said, but here is a guess: chillin' and boolin'. Chillin' (chilling) means relaxing. Boolin' is kind of complicated: The original word is "cooling" (also relaxing), but there is a custom among members of a gang called the Bloods to change the first letter of words to "b". If you talk to your friend again, find out if I'm right or wrong and let me know!