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Someone who doesn't have the guts to be a full vegetarian but will eat meat once or twice a week. Will still lecture you on the evils of eating meat though.
Laura: I'm a semitarian, I basically just eat vegetables and tofu now, it's so much healthier.

Dave: But don't you have a steak once a week and chicken on Tuesdays?

Laura: Semitarians are allowed that, which is still better than you and your rampant lust for meat.
by StewieG Wannabe January 28, 2010
A semitarian (or semi-tarian) is a vegitarian who eats certain types. Of meat (eg: chicken, fish)
Jimbo is now a semitarian
by Loooserlf March 18, 2010