To use this phrase you must be rather confused, not quite part of a conversation, and perhaps stood away from a group of people but listening to their conversation. If you are stood amongst people, but not listening to what they say very closely, you may ask them to 'bubble' you 'in' meaning you would like them to tell you what they're talking about and to involve you in the conversation too.
Hey Jackson, I didn't quite hear that I was stood by the bar! can you 'bubble me in'?
A term used for your friend, most often one that you see the most but isn't your best friend. In this case, it can be shortened to brobble. Below brotato, bro, etc. Can also be used to tell someone that what they said is corny in a casual and non-formal way.