Vigga

A vigga is a vegetarian.

According to Korey Coleman during his NSFW appearance for Meat Drunk, it's a term that is only acceptable for vegetarians to use when referring to fellow vegetarians.

"Vigga, please!"

Vegro

Similarly a vegro is a vegan.

Other Uses

The Vancouver Island Grape Growers Association was formerly known as "VIGGA", until they changed their name to WIGA (Wine Islands Growers Association).1

Vigga is apparently also a proper name in Iceland.