The 'Let's keep this on' meme originates from a humorous illustration where a character with an orange circular head is asked why they always wear a mask. Upon lifting it, the character's face is humorously dominated by a giant cigarette. This absurd and unexpected reveal is the punchline, making it clear why the mask stays on. The meme draws on the comedic trope of hiding a ridiculous or embarrassing truth, and this visual gag translates well into the digital world where many people relate to keeping certain aspects of their lives under wraps.