The term 'Go (as) MASQUERADE' is a phrase that refers to the act of disguising oneself in order to hide one's identity. It is often used in the context of a costume party or other event where people dress up in costumes to conceal their true identities. MASQUERADE is also used to describe a situation where someone is pretending to be someone else, such as an undercover police officer or spy. The term is derived from the Italian word maschera, which means mask.