HITS' is a term used in slang to refer to popular or successful songs, albums, or artists. It is an abbreviation of the phrase 'high in the charts', which refers to the position of a song or album on the music charts. The term BOPS, which is a four-letter word, is also used in slang to describe these popular songs or albums. It is an abbreviation of the phrase 'banging on the speakers', which refers to the loud and energetic sound of these songs when played at high volume.