The word "cockered" is derived from the verb "to cocker," which means "to pamper or indulge." When a person is cockered, they are given too much attention and praise, which can lead them to become arrogant and self-important. In some cultures, cockered children are considered to be a nuisance, while in other cultures they may be seen as a source of pride.
The word "cockered" is also used in a more general sense to mean "spoiled or rotten." For example, a person who is constantly being given gifts or favors may become cockered and expect to always get their way. In this sense, the word "cockered" has a similar meaning to the word "entitled."
Overall, the word "cockered" has a negative connotation, and it is used to describe someone who is arrogant, self-important, or spoiled.