...translation from juggalox internet speak to follow...
"My dad's car battery was dead because I left the interior light on and I had to walk home after dark. It was cool though because I had my Crossman 10 pumper pellet gun loaded with darts with me from shooting at the dart board in my friends basement."
I think you're confused. The adage your mom tought you was "If you can't say something nice then don't say anything at all", not "don't say anything at all, unless it's not nice".