Green’s Dictionary of Slang

segs n.

(N.Z. prison) an inmate who prefers to stay in their cell rather than to mingle in the prison population.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 162/1: segs n. 4 a loner, an inmate who remains constantly in his cell, segregating himself from other inmates.

In phrases

seg segs (n.)

(N.Z. prison) an inmate who, while already in the segregation block, is further segregation from the other prisoners there.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 162/1: segs n. seg segs a procedure whereby an inmate on segregation is segregated from his fellow segregation inmates.