The shirt reads: “U DIN” above and “DIN DIN DUN” below.
Between them, the same orange-headed character stands flexing both arms, heavily muscled, in front of a burst of blue lightning, printed in the chrome-and-bolt style of a bootleg tour shirt.
It is a sound, not a phrase, which makes it completely impenetrable to anyone outside the meme. That is the intended audience. For the very online, and for anyone who collects shirts that cannot be explained to a parent.
