Writers often overuse a few unique words, creating a linguistic fingerprint. Vocabulary words are also exchanged between social groups. Some people contribute new words, while others adopt them. The process is not entirely random, though:
Diana Boxer, a professor at the University of Florida who specializes in sociolinguistics, says that when we find ourselves in a situation where someone uses language differently than we do, or words we’re unfamiliar with, we usually respond in one of two ways. “We either start to mimic them in some way, or distinguish ourselves from their usage,” she says. “This has to do with how we want to portray our identities. If we identify with them, want to be like them, we’ll start speaking like they do.”