bubillion means: It is a number used to refer to extremely large quantities. This number does not have a definitive number and it’s not a technical number. Instead, it refers to the sum of all numbers larger than the one that was just mentioned. When trying to identify a greater amount than one’s opponent, it is used much like infinity. This number comes from Keith and the Girl Katg.com podcast. Keith is one of the main hosts and is well-known for using the term frequently. This has made it a common teen slang. (in Community Dictionary, added by Kerasine)