From Wikipedia, the free encyclopedia. Biffy Clyro are a Scottish rock band that formed in Kilmarnock, East Ayrshire, comprising Simon Neil (guitar, lead vocals), James Johnston (bass, vocals) and Ben Johnston (drums, vocals).Mon the Biffy! or, in more recent times, 'Mon the Biff!, are well known chants among Biffy fans, usually shouted in between songs at gigs, or before the band comes on stage. The band have never disclosed where the name 'Biffy Clyro' originated, giving a series of stories as to how the name came about.