A condition of baffling immaturity. Someone who just cannot let go of something and grow up. The term comes from the hypothetical situation of someone who has had their crayon stolen in the 2nd grade and they haven't gotten over it since.
The people who get picked on in school and then get a position of power to abuse people later in life could be said to have a crayon complex.
Someone who uses childhood trauma as an excuse to be a peace of shit later.
I can't believe he still brings that up, he has such a crayon complex.