It's a derogatory term that describes someone who pretends to be a gangster or tough but is actually weak, phony, or unauthentic.
Think of someone who tries to act hard and tough, but their actions or lifestyle don't really match up. They might wear expensive clothes, talk about being in gangs, or brag about things they haven't actually done.
The term gained popularity in the late 1990s and early 2000s, often associated with hip-hop culture. It's often used to criticize someone who tries to emulate a gangster persona without actually having any street cred.
It's important to note that this term is considered offensive and derogatory, so it's best to avoid using it.