It’s WYO (write your own) not wax. I’m guessing the GP was on their phone and it autocorrected the word.
https://d3n8a8pro7vhmx.cloudfront.net/afacwa/pages/687/attac... (page 318)
https://d3n8a8pro7vhmx.cloudfront.net/afacwa/pages/687/attac... (page 318)