Found it here, and it seems Sid Kipper (alias Chris Sugden) is responsible:

AWAYDAY
(Sid Kipper)

Chorus
Away day, away day, loco in transit
Omnibus, St pancreas, away day
Away day, away day, loco in transit
Omnibus, St pancreas, away day

Cleopatra virginae, terra incognito
in loco parentis caesar mutlio calcutta

Chorus

Troyalus et Cressida, con Homo erectus
Strangulated hernia, coitus interruptus

Chorus

Romulus et Remus, in flagrante delicto
Honi soit qui mal y pense, Harry Belafontee

Chorus

Gina Lollobrigida, Osteo Arthritis
In vino veritas, Peter Dominicus

Chorus

Non compos mentis, continuo ad nauseam
Ad lib, et cetera, quod erat demonstrandum

Chorus repeat