The line comes from Cardi B, the Bronx born rapper who built a following with unfiltered videos and catchphrases before her music career took off. Her regular degular shmegular wording was meant to stress that she was ordinary despite growing attention, and fans clipped and repeated it until it became a signature quote. Online it survives as a meme used for self introductions, edits and reaction posts, because the rhythm and slang are instantly quotable and tied to her early personality.