Yassification is giving someone or something a glow-up or makeover. As this term sprout from LGBT circles and social media overall, to yassify means to make something better or queerer.
References to yassification typically include girly hand gestures like limp wrist, finger to cheek, holding handheld electric fans and/or applying makeup / beauty filters to otherwise masculine looking characters for contrast.
This tag automatically adds meme (learn more).