The recent thread about veggie-burgers has made me think about the word veggies. As a noun, I gather it is used in informal Leftpondian to mean ‘vegetables’, whereas here in Rightpondia it means ‘vegetarians’ - except in baby-talk, as in “Diddums eat up all his nice veggies!”; it always sounds odd to me for adults to call their peas and beans ‘veggies’. Over here, vegetables have always been veg for short, as in the classic formula ‘meat and two veg’. So if I had vegetarian guests coming for lunch, I might say ‘What veg should I cook for the veggies?’.
As an adjective, of course the word is ambiguous in many contexts: in the case of veggie burger or veggie option it’s moot whether it’s a burger / an option that’s made of vegetables or designed for vegetarians. I tend to construe it as the latter, but that may just be me.