Douche bag, or simply douche, is slang vocabulary that dates back to the 1960s. The metaphor of identifying a person as a douche is intended to associate a variety of negative qualities, specifically arrogance and malice.
Everyone knows their fair share of douchebags, or has heard some wild stories about people that included douchebagitis or douchebag-type behaviour. So how about those guys that always have their car stereo on. I mean, they always f*ckin do. Not when they are driving around, I don't mean that. That's when you should be listening to sh*tty music, but I mean all those other times that are just there to bother people. Like when they stop and get gas. They turn the car off, don't get me wrong. That's a giving. No one wants a spark or anything blowing your sh*t up, but they then proceed to just turn on just their stereo. And it's never just on, it's f*ckin ON! Like it's at its highest decibel possible, or at least close to it. Like who the f*ck needs to hear Akon anymore than we already do? Do we really need the most overplayed, commercial sh*t thrown at us some more. Did they just get the CD recently? Did they just discover downloading or something? What are you trying to prove to everyone? Do you get cool kudos for liking a particular song? No you don't. Maybe there's a chance that a Jeep TJ full of hot ass would drive by and hear the music. They would then screech to a halt and 180 that sh*t back to the dance party ensuing.