What does horslips mean?
The lads - as in The Horslips themselves - are on record as saying they were goofing around and somebody suggested calling themselves The Horsemen of the Apocalypse to which another band member replied something like The Poxmen of the Horslips.
So it doesn’t mean anythinng - unless the joining of the words ‘Horsemen’ and ‘Apocalypse’ means anything.