The phrase "abogado de sabado gigante" literally translates to "lawyer of giant Saturday" in English. While it is not an obviously meaningful phrase in either Spanish or English, it may refer to a program on Univision television called "Sabado Gigante."
The person using this phrase may be searching for an attorney that appeared on that program. The Spanish word "abogado" is closely related to the English word "advocate" and has the same meaning. It is usually used to refer to a lawyer. "Sabado" is the Spanish word for Saturday. "Gigante" means gigantic or giant. "Sabado Gigante" is the name of a popular program on Univision Television.