Pig Latin has nothing to do with Latin. It is a jargon in which the first letter of a word is moved to the end and combined with "ay"; e.g., "cat" becomes "atcay" and "dog" becomes ogday." Words beginning with a vowel have "yay" appended; e.g., "art" becomes "artyay." Pig Latin's origin goes back to the "Hog Latin" of the 1860s, in which nonsense syllables were added to words. There was also a jargon known as "Dog Latin" which added Latin-sounding syllables to words.
In the Three Stooges 1938 short
Tassels In The Air, Moe was trying to teach Pig Latin to Curly. Gesturing to himself and to Larry, Moe said, "Moe, Omay. Larry, Arrylay." He then gestured to Curly and said, "Curly..." Curly gleefully exclaimed, "Curlycue!" Moe said, "Boy are you umbday!" Curly asked, "I'm umbday in pig language?" Moe replied, "You're umbday in
any language!"