The term "fifty-center" is typically used in the context of hip-hop slang to refer to a person who is perceived to be fake or insincere. However, there are a number of other synonyms that can be used to describe individuals who display these same characteristics. Some of these synonyms include poseur, pretender, imposter, fraud, sham, fake, phony, charlatan, counterfeit, and imitator. Each of these terms can be used to describe someone who is trying to be something they are not, whether it's in the context of hip-hop culture or any other social arena.