Green’s Dictionary of Slang

has-been n.

[As one inmate explains: ‘He “has been” there and he’s going to be somewhere else, later’ Looser (2001)]

(N.Z. prison) .

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 85/1: has-been n. has-been n. an officer not assigned to any particular wing or set of duties, placed wherever in the prison he is needed.