Rizz is internet slang for charm and flirting skill, popularised through TikTok captions, comments and short edits where creators boast about their ability to impress a crush. The phrase rizz her up turns that slang into a direct challenge, and clips built around it spread as reaction audio for confident entrances, pickup attempts and playful couple content. As the slang stayed in everyday online conversation, other Rizz sounds kept circulating alongside it, and this version remains useful because its meaning is instantly clear to viewers who already know the joke.