In Bulgarian, the word for meat is месо [meh-so], but just as in any language, slang words are common -- and often the most appropriate diction in the circumstances. Мръвки is one of those words that exist in every language referring to meat (in the plural, no less) -- and usually the greasier, the better.
This is a home-cured sausage waiting for winter. I guess it's about that time ;)
Well, maybe it's going a bit too far to claim that every language -- or even many languages -- have such a slang word, considering the vegan/vegetarian movements in most Western countries :D But there you have it, Bulgarians (and I dare say Slavs in general) love their meatses!