Why do people say onething, but they mean another thing?

what does it mean when somebody says that they're guilty as charged?

What does it mean when people say you have an ulterior motive?

what does it mean when someone says I gave him the means to the ends?

What does it mean when someone says against the grain should be a way of life

What does it mean when someone says your first on the bad list, and you're last on mine

what does it mean when somebody says that their gonna push the envelope?

what does it mean when someone say I think the fruit is rotten? as in the saying

What does it mean when someone says he's 2 years her senior? Or he's 2 years her junior? just wondered :)

what does it mean when someone says back roads always lead to something?

What does this saying mean : not too shabby . ??