Delulu started as fandom slang for “delusional” and evolved into a Gen Z meme for playful, performative confidence. TikTok supercharged it in 2023 (with #delulu ~1.6B views at that time), Instagram turned it into caption humor, and by 2025 the word was dictionary-official and even popped up in parliament soundbites. Use it to laugh at your own boldness—and then turn that energy into real-world steps.