A new low in truck stickers

At least for this guy it is... His last truck (an Explorer Sport Trac) read: "I only hunt two legged deer" next to which was depicted the outline of a girl with antlers. Now he has reached a new low, his Dodge (with cummins diesel) reads: "Your Mother Should Have Swallowed". Why in the FUCK would you put something so offensive to...well... anyone ever, on your truck?