'self-rewarder' originates from the combination of 'self' and 'rewarder', where 'self' refers to one's own person and 'rewarder' means someone who gives rewards.

'self-rewarder' evolved from the concept of self-motivation and self-encouragement, combining the idea of rewarding oneself for achievements.

Initially, it meant 'one who rewards oneself', and this meaning has largely remained the same in modern usage.