Dipped coins

So I am familiar with the process of dipping coins to restore them to a blast white state. After browsing through this website and quite a few others I have seen people use the phrase "dipped out" as in, "yes that coin is well struck but it looks dipped out."
Can anybody tell me what exactly that means? Is it just a coin that has been dipped to long or by an unskilled person? I am also assuming a dipped out coin would be less desirable to many than a coin that is either original or has been conserved (dipped?) by someone who is skilled.
These questions precede my last question and that is: how do I determine if a coin has been overdipped or harmed by an unskilled collector/dealer? Is there a way to do so from photos (like trueviews)? I personally prefer coins with gentle toning and a more original look but at present have my eye on a blast white walker that has an above average strike.
Thanks!
Comments
"Dip" is essentially an acid, as far as I know, that strips off the top layer of the metal. You can only do that so many times (or maybe once, if you do it wrong) before all lustre and surfaces are destroyed.