What does Best-Behavior Friend mean?

Best-Behavior Friend meaning in Urban Dictionary

also referred to as 'BBF'; a friend that you have very small in common with and you react on your best-behavior if you are with.A best-behavior friend doesn't typically know the extent of the real personality or transgressions since you misrepresent the truth to create your self look great or innocent. People with a best-behavior relationship often see the friendship as essential or long-standing and so lying about situations or making down key facts becomes common.