a character in a nursery rhyme (=an old song or poem for young children) . The rhyme goes: Wee Willie Winkie runs through the town,/Upstairs and downstairs in his nightgown
To wee means to urinate. Wee is an informal word used especially by children. He said he wanted to wee. Wee is also a noun. The baby has done a wee in his potty = pee. to pass water from your body - used by or to children = urinate