Did a good job. Succeeded at something.

She ate in her last TikTok.
History and usage

The phrase 'ate' used as a slang term is believed to have originated from Black and LGBTQ+ communities in the 2000s. Similar to slay, people started using it as a way to express praise for someone, usually a woman, during a drag show. Overtime this term has made its way into other communities and has become widely used on TikTok.