The abbreviation AKA (pronounced "e-kei-hey") stands for "Also Known As," that is "also known as ...", and after it follows another name under which this character is known. For example: Glory of the CPSU AKA Purulent, that is, "Glory to the CPSU, also known as the Purulent."
In his famous parody battles against Shnurov, Urgant is represented as follows: "Ivan Urgant AKA Joaquin", although under the pseudonym of Joaquin, he was not known before. The whole trick is that rappers often take a few pseudonyms, purely for the sake of HYIP and cheap Ponte. And Urgant, in his cunning manner, obevyvaet this phenomenon, appearing as the unknown Joaquin.
AKA is in the list: Slang