According to the Official Google Research Blog,
Today it is our pleasure to announce the launch of Pig Latin Voice Search! [...]
To configure Pig Latin Voice Search in your Android phone just go to Settings, select “Voice input & output settings”, and then “Voice recognizer settings”. In the list of languages you’ll see Pig Latin. Just select it and you are ready to roll in the mud!
It also works on iPhone with the Google Search app. In the app, tap the Settings icon, then "Voice Search" and select Pig Latin.
Despite the date of the post, I can testify that [ˈæ.vəˌgeɪtˌneɪ ˈuˌteɪ 'i.tsəˌpeɪ] actually works!