Here Is the Answer:
I thought how Phoebe and all the other little kids would see it, and how they'd wonder what the heck it meant, and then finally some dirty kid would tell them - all cockeyed, naturally - and maybe even some mean person would hear it and ask them if they knew what it meant. It upset me a lot."This quote shows Holden's disgust with the adult world that introduces children to vulgarities they may not even understand. He thinks adults are hypocritical for claiming to protect children's innocence but then polluting their minds.