The word '''nerf''' is an adapted word from the MMO community, much like the MMO community adapted the word "zerging" from "Zerg rush". The meaning word itself refers to NERF-brand plasticized foam; a soft, spongey material designed specifically not to harm children. The MMO community adapted the word due to its associations with being 'safe' and 'harmless'. In the context of the game, the word 'nerf' usually refers to changes in a patch where a class, race or other classification of the game has been lowered quality or efficiency. It could also mean that the price for something used has increased.