Only the new 5G iPod has Siri. To turn off gp to Settings>General>Siri and turn it of.
If you have a 4G you may have VoiceOver accessibility veature turned on. To turn off see:
I can't! I'm not sure what this program is called, but I'm begining to think it's not Siri. There's nothing in the General for Siri. What happens is that I now have a voice that tells me everything I'm doing. But it's gotten stuck and now I have to double tap everything and I can't change between my screens. The voice controls are acting stupid right now too. I normally don't use the voice control but I thought I'd try using it to shut this program off. But the voice controls are not understanding what I've said and keep turning on my music and I can't shut that off now either.
As I said then
You have the accessibility VoiceOver feature turned on.
Triple click the home button and try going to Settings>General>Accessibility and turn VoiceOver off. You may have to use three finger to scroll the screen to get there. If problems see: