This is an officially licensed Family Guy product.
T-shirt has an image of Stewie bent over and looking backwards with text: "Spank me I've been a bad boy." In all likelihood he's hiding a gun in his overalls so be careful - this might be a trick.
Memorable Stewie moment: "Hmm... The ruptured capillaries in your nose belie the clarity of your wisdom. You're saying I must return to face this man in white myself. So be it. As for you, kind sage, I only hope my heartfelt thanks will keep you warm as you spend the next ten years IN FROZEN CARBONITE!!" - from Family Guy episode Chitty Chitty Death Bang.