o.p. adj.
1. (Aus.) of rum, over-proof, i.e. very strong; also as n.
![[Aus]](/static/img/flags/aus.png "Australia") | Bulletin (Sydney) 24 June 20/4: [W]ith the next load of horse-feed there arrived a hogshead of hops and a case of 28 o.p. rum [...] The boss took him up tenderly and poured a stiffener 0f 28 o.p. into him. |
2. (Can. prison) restricted, off privilege.
![[Can]](/static/img/flags/can.png "Canada") | Go-Boy! 318: OP – Off Privilege, restricted. |