From the combination of jib as meaning one's personality and of maneuvering a bicycle.
A Jib Jib is a person whose personality is the product of others' personalities around them. These people often have no real ideas or opinions and are incredibly dull.
Another and more common and less controversial term for the word “fictionkin”.
To describe that one is in fact the real life incarnation of a fictional character/ a term to say you deeply relate to a character.