köken: Onomatopoeic. Some link it to Old French claquer (“clap, clack, clatter”), which is ultimately from Proto-Germanic *klakōną (“to clap, chirp”). Cognate with Spanish cháchara and French tchatche.
köken: According to Max Vasmer, comes from деру́, драть (dratʹ). Compare typologically дребеде́нь (drebedénʹ), чепуха́ (čepuxá). Compare otherwise also Polish bzdura.