NaBub is a combination of the phrases "night night" and "bye bye" which someone might say when you are being dismissed from a conversation whether you like it or not.
Jordan and Cassandra are talking about a cute boy at school. Stephanie comes up and starts talking about Algebra. Jordan and Cassandra want to keep talking about the boy and say to Stephanie: "NaBub Steph."
by Tangage and Karpage May 21, 2009