Pimp, hack and mod all mean change, but have different uses. I would pimp out my car but i wouldnt hack out might car. I might mod my cloths but i wouldnt hack them either. Hack has a more negative tone as in hacking into a computer and changing its programs. Pimp has a positive tone. When you pimp something you make it cooler and more styling. Its normal to pimp a car or pimp out my crib. Mod seems to be a more middle of the road term and could swing either way