Bydlo (Russian: быдло, stress on the first syllable) is Russian slang, although the word itself is of Polish origin. Spending a considerable amount of time in Russia, you will hear this word repeatedly. Beware that this is an offensive type of slang. Bydlo is a term for folks with low moral and social standards who are rude, demonstrate antisocial attitudes, and are disrespectful and insensitive to others. Very often, those are individuals or groups who show ostentatiously repulsive behavior, being oblivious to how embarrassingly it may look in the eyes of others. They lack any self-criticism and are proud of who they are and how they go about life. In many ways, bydlo is a life philosophy that people follow unconsciously, being products of the social environment in which they were raised. Such people are for the most part uneducated, ignorant, and their life interests are very grounded, while their lifestyle is extremely unsophisticated. Bydlo deny any freedoms and willingly submit to authority. They do not value personal opinions and individuality in any form, and their life is guided by socially prescribed rules and expectations. Oftentimes, people called bydlo are prone to bad habits. Calling an intelligent person bydlo to their face is an offense. In many cases, bydlo people might accept this name-calling (but I wouldn't experiment). Bydlo cling to the crowds of like-minded; thus, in a way, it is a vast social group. By the looks, bydlo people can hardly be recognized, despite some hints in how an individual is dressed. Qualities of bydlo start expressing themselves when you deal with such people or experience the aftermath of their behavior. 

In the picture: Results of bydlo behavior. This picture was taken in Moscow, in a prestigious neighborhood four stops away from the ring line. As much as this is disgusting, it is not an unusual sight in Moscow.