The phrase, "you do you, boo" is one of my favorite phrases I've been blessed to hear over the past few years. I like the phrase as an excuse to be one's true self and to follow one's own passions. A mantra to stand by as one pursues the life that best reflects their values, wants, and needs. A sort of light to help navigate one to find their own tribe of people to help them achieve goals.
Maybe I am reading too much into it. Maybe I am making the phrase out to be more than it is really worth. However, this is what the phrase means to me and you got to do you.