A usually pretentious human who denies themselves meat, dairy, eggs, and fish in an attempt to be politically correct. Usually they will sight a study by an obscure hippy Dr. that says this diet is healthy, or declare that animals should have the same rights as people or other lame nonsensical arguments.
The Vegan is also someone who usually enjoys pointing out your "wicked" meat eating ways and pretends that soy products are actually palatable. Symptoms of a vegan are sucked in paper thin skin that shows every detail of their skull, and declaring themself an "environmental activist."
The kids really enjoy teasing the vegans by kicking their puppy and eating tons of bacon.
The vegan broke his leg because instead of drinking real milk, he drank soy juice.