I have seen a few posts that highlight the fact that the some tags are being used incorrectly e.g. this question here regarding the assembly tag.
What about the idea of displaying the tag excerpt on the Ask Question page? With some text along the lines of of "These are tags you have chosen, are you sure about this?"
When tags are input the relevant tag excerpt (if available) would be retrieved. The excerpt could be displayed either below the tag input box or down the left hand side pane. Some kind of loading indicator could be displayed to let the user know something is happening.
This could at least alert the user to the fact they may be inadvertently choosing the wrong tag.