If you think your boss is a jerk, you tell him everyday. If you think your daughter is not cute enough to get a good boyfriend, you tell her that whenever it pops into your mind.
The article notes its is if there is no filter from your brain to your mouth. You say it when you think it.
Personally I think it is a stupid idea. There's a reason that the filter exists -- otherwise we likely would have evolved to have no such filter (the filter was probably an evolutionary development as I suspect the default is to have no such filter).