(short for - Brownest Of All Time) is a term like GOAT used to refer to anyone from South Asiancountries like India, Pakistan, Sri Lanka, Bangladesh etc. It is used to either describe the person’s skin tone or their inherent brown family habits.
John - Hey man, why have you hoarded so many plastic bags inside this big plastic bag in here?
Arun - I don’t know man. Maybe because I’m BOAT and I’ve always seen my mom doing that.
Face. Derived from the cockney rhyming slang 'Boat race' for face. If you wish to make it sound even more ridiculous, try saying it with a false Jamaican accent.