According to Genius, "Taki Taki has no official meaning, and it is believed that it is used in the song just for better sound." However, one of the lyrics in Selena's verse is "What my taki taki wants // My taki taki gets" so it could be a synonym for "punani" which Cardi raps about. 'Taki Taki' also means "anal sex" according to Urban Dictionary so there are a lot of theories atm.