"Wert on the fence" is a colloquial expression that can be spelled in different ways, such as "were on the fence" or "were't on the fence". The correct pronunciation of this phrase is /wərt ɒn ðə fɛns/, with the first word "wert" pronounced with a short 'e' sound followed by a /t/ sound. The phrase means to be undecided or unsure about a situation or decision. While the spelling may vary, the correct pronunciation remains consistent.