BBreb is a colour beyond human imagination, something you can’t comprehend. The word can also be used as a metaphor for things humans can’t imagine. As such: infinity, Cheesebrexmed and The never ending trip (The End).
There are many theories about seeing BBreb, some people believe you see when you die or consume frog venom, but at Brex HQ they’ve discovered a way to potentially get access to this colour. They say if you rip off Mabe’s wig, eventually BBreb will turn up…