Green’s Dictionary of Slang

boep n.¹

also boop

[Afk. sl. boep, a prison]

(S.Afr. prison) a prison.

1974

H. Levin Bandiet 8: Boop means prison.

boep-chappies (n.)

(S.Afr. prison) prison tattoos.

2005

A. Lovejoy Acid Alex 148: He was a big, fat, vuilgat ou with kak boep-chappies all over him.