It was the joint winner with three other entries. These entries were Salomé singing "Vivo Cantando" for Spain, Lenny Kuhr singing "De Troubadour" for the Netherlands and Frida Boccara singing "Un Jour, Un Enfant" for France.
The song was the second entry with a nonsense title to win (after Massiel's previous triumph with "La La La"), and became infamous in the comedy world - most notably inspiring Monty Python's Flying Circus to parody it with "Bing Tiddle-Tiddle Bong" (Python precursor I'm Sorry, I'll Read That Again had previously had Bill Oddie do something similar with a song for which the title was rendered entirely in sound effects).
Lyrically, the song is a plea from the singer to her lover to "cuddle me tight". She then goes on to explain that "my heart goes boom bang-a-bang boom bang-a-bang when you are near", complete with appropriate musical accompaniment.