The fact or instance of speaking falsely or unclearly.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "misspeaking" in a sentence
"I'm sorry .... if you are unable to see that "misspeaking" is a polite way to say someone is "lying" – then the "retarded" label fits."
"Even if this most recent sample of misspeaking is innocent (which I suspect isn't) she should know better."
"For Bush cultists like troll, misspeaking is a very bad thing - unless you are a Republican, in which case it is ok to say bald-face lies in order to invade a nation that poses no threat."