Giving brain and head means that some is having Head and getting knowledge for example a teacher has sex with one student one day they give head next day knowledge.
Guy1: Have you heard of Brian he go brain and head with the oldest teacher Guy2: NO WAY DUDE!!!
Guy1: LOL
When you and another person have the same exact thoughts. Being extremely brainconnected happens when you both say very specific/random things outloud and at the same time. (Another word for jinx I guess...)
A: "I don't know why , but I'm thinking of smoked salmon with spread and a tiny sprinkle of pepper and herb salt"
B: "oH MY GOD SAME"
A: "What the-"
B:"..."
A and B together: "BRAINCONNECTED"