yassify
To apply several beauty filters to (a picture or video of someone), typically making the subject look more made-up, potentially more feminine, and often unrecognizable.
transitive
To yassify yourself and get stuck in with the yassification trend on Twitter, it's kind of up to you on your best photo editing method. The most commonly used one, though, is FaceApp. Once you've got the app, you can play around with the various different filters available and yassify yourself to your heart's content.
Where it comes from
Back-formation from yassification, equivalent to yass + -ify. Popularized by the YassifyBot account on Twitter (which is not actually a bot) created on November 13, 2021 by a college student known online as "Denver Adams" who would repeatedly run images through FaceApp until they were virtually unrecognizable.
Adapted from the Wiktionary entry yassify (CC BY-SA 4.0).