Green’s Dictionary of Slang

probie n.

also pro
[abbr.]

1. (N.Z. prison) a probation officer.

[US]E. Droge Patrolman 31: One of the ‘probies’ spoke up.
[NZ]G. Newbold Big Huey 252: probie (n) Probation or parole officer.
[NZ]McGill Reed Dict. of N.Z. Sl. 163: pro/probie 1. Probation officer.

2. a probation order.

[NZ]McGill Reed Dict. of N.Z. Sl. 163: pro/probie [...] 2. A prohibition order, preventing someone coming within a certain distance of someone else, usually because of violent actions.

3. one who is ‘on probation’ to become a full member of a gang.

[NZ] McGill Reed Dict. of N.Z. Sl.