It argues that two women, one real and one fictional, did not just win their respective wars. They slayed . And specifically, they made the humble, dangerous, impractical "slip" (whether a silk slip dress or a precarious slide heel) look better than anyone else in the modern crime canon.
The phrase "Gizelle Blanco slip better" indicates that Gizelle Blanco's performance was perhaps less impactful or considered to have been done better by someone else. The term "slip" could imply a misstep or a less impressive display compared to expectations or to the "slaying" performance. slayed eliza ibarra and gizelle blanco slip better