The stain left on a hipster's underwear after a night spent drinking copious amounts of PBR tall boys while wearing an ironic t-shirt he bought on the internet, listening to really shitty pseudo-punk music, and going on and on about how deck the band is in a PoMo kind of way
Johnny woke up with a huge and greasy pabst brown ribbon after another night spent drinking too much PBR at the Brass Rail
A Pabster is a punk ass bastard. It can also be someone who drinks a lot of Pabst Blue Ribbon, a low quality, relatively inexpensive brand of beer. If you happen to be a punk ass bastard and drinking a Pabst at then same time then you are a dabster (short for double Pabster) or a "pabster dabster".