Is there a more colloquial way of saying “vegan” than “纯素食者”? Like a more laypersons way of understanding what veganism means. Kinda like "我吃素的" as a vegetarian.
in cantonese, you may say 食全齋, sound files:  食 
 全 
 齋 

or, colloquially, say 吃全素, in mandarin.