Mymra. Came into use from the Komi-Permyak dialect. And it means gloom, unsociableness (“mymryt” – to sit at home without getting out). Then they began to call boring, dull and unremarkable people that way.
Bastard. It came from the word “drag” – to remove the remaining debris, weeds, roots from plowing. Then it began to be used in the meaning of a crowd of asocial citizens gathered together.
Trash. The rest of the liquid, alcohol at the bottom of the container with sediment. Unsuitable for drinking. But the tavern regulars collected it and finished it. It began to be used to refer to people who find themselves at the bottom of life. And then it took on a modern meaning.
Vulgar. Here, too, everything is simple: the origin of the word “let’s go.” It meant everything traditional, ancient, solid, immutable. After Peter’s reforms and the fight against the old “vulgar” customs, it acquired a negative connotation – uncultured, primitive, backward.