5 Seconds of Summer September 14, 2018 by SMF · Published September 14, 2018 · Last modified September 12, 2020 Meaning of “Valentine” by 5 Seconds of Summer “Valentine” is a love song by the noted Australian pop rock band 5 Seconds of Summer (5SOS). According to the band’s guitarist Michael Clifford, “Valentine” is purely a Valentine’s Day song. He called it...