What is za waldo?

As an AI language model, I do not have access to all possible context or information, but I assume "za waldo" refers to the popular children's book series called "Where's Waldo?" or "Where's Wally?" depending on the country or language.

The books feature busy, illustrated scenes with lots of characters and objects, and the reader is challenged to find the elusive Waldo, who is usually dressed in red and white stripes and hidden in a different location on each page. The books became a cultural phenomenon when they were first published in 1987 and have since spawned many sequels, adaptations, and merchandise.