You, sir, have a job. A lot of people don't.
If they are so backed away by it, they are not worth your time.
Tell the ladies that you work with animals and you feed hungry children.
Heh. Well played.
I agree with Qururt, at this point in time it is great to have a job and to be making some money. Quite honestly my first impression of the job would not be "wow that's weird" I would find it interesting and ask you to explain. But I am also a man.
Lets' see - a vegetarian that works at a slaughterhouse.......
Are you actively looking for another job? Going to college in your spare time? Jobs are hard to find, and if one has a job one should be grateful. But still, if you're embarrassed about what you do, you should look for something else. Don't quit your present position until you have a solid offer. If you want to stay where you are, flush the embarrassment. Be proud of what you do. Being embarrassed about one's line of work is not manly. It's honest work. There is a need for meat processing; very few people butcher their own animals. When the subject of employment comes up, my advice is to just be up-front and confident. Try to imagine how you come across to a lady, when you present yourself as someone ashamed of what he does for a living.
Have any of your male co-workers dated women? Ask them how they handled it. Contact a dating service, and ask for their professional advice about how to put your proverbial best foot forward.
Ever thought about just calling yourself a "butcher" at the outset, rather than a "slaughterhouse employee"? I know there's probably a difference. But, people probably understand butchers better. You can always clarify what you meant by "butcher" later on, if the relationship goes any further.
Can't say I've ever met a vegetarian butcher, though. Seems like a fairly unique circumstance. Why are you a vegetarian -- is it principle, health or just taste? Or, have you just seen too much? Do you find butchering animals morally wrong? Is that why you're embarrassed? I've known vegetarians that thought killing animals for their meat was morally wrong. If that's the case ... you might ought to find a line of work that doesn't offend your principles.
I knew of a guy (uncle's friend) who had a job as a baggage handler at the local airport. He made up business cards to hand out when he met women at the bars which identified his job as a ramp rat.
I think the light humour helped break the ice with women.
I don't give out advice about relationship matters with women. But seriously...where the hell do they think meat comes from??
Obviously it doesn't sound like you will be doing this for the rest of your life since it probably isn't your passion, but I think the kind of woman worth marrying will be happy that you are willing to do things you don't like to support your family.
And in the mean time I am sure there are better ways to explain your job without saying you work in a slaughter house. Just mention, I am the guy who makes that steak you are eating more possible. Just joking but really.