The word "pee wee" is often associated with something small or diminutive in size, but its antonyms can range from big to large, gigantic, colossal, and immense. While "pee wee" may be used to describe a little bird or a tiny toy, its antonyms can describe a massive building, a huge elephant, or a colossal dinosaur. Other antonyms for "pee wee" include mammoth, giant, massive, and substantial. Therefore, it is essential to choose the right antonym based on the context in which you want to use it. So, while "pee wee" can be endearing, its antonyms can be powerful and impressive.