The word "污言秽语" is formed by combining two parallel two-character phrases: "污言" meaning foul speech, and "秽语" meaning obscene language. In each phrase, the first character (污 or 秽) conveys dirtiness or filth, while the second character (言 or 语) denotes speech or words. Their union creates a compound term that intensifies the meaning through synonymous repetition, specifically referring to vulgar and offensive language.