pronounced toe fool
A flamboyant vegetarian, one who doesn't stop at simply placing an order for a menu item, but insists upon analyzing and discussing (loudly) various health food options, vegan alternatives, etc., all in an effort to impress those around him/her with his vast storehouse of knowledge on the subject
Dude- shut up and order! No one cares how much you know about sprouts! You're acting like a complete toful.