The correct spelling of the phrase "wast the fence" is actually "wasn't the fence." The reason for the confusion in spelling might be due to the fact that the contraction "wasn't" is pronounced with a silent "t" at the end. In IPA phonetic transcription, the word would be written as /wɑznt/ to properly represent the pronunciation. It's important to use the correct spelling and pronunciation of words to avoid confusion and be understood accurately when communicating.