Well when I think of internet lolcows in general, I think of Encyclopedia Dramatica in all of its obscenity and insanity. More likely than not ED introduces me to the existence of many lolcows.
A plushie for me will best describe a lolcow. Example, if they have a plushie of mlp, female, sonic characters, or Bishkek character from a manga/anime, chances are they fap to that character and refer to them as their imaginary spouse (note I'm not saying that about people who have plushies, just the lolcows).