Green’s Dictionary of Slang

1. (Aus.) a South African; also attrib.; thus Yarpieland, South Africa.

1984		Nautical Qly 25 20/2: Aussies, Yarpies, Pommes and Frogs (to answer your question, a Yarpie is a South African), as they like to call themselves.
1986		National Times 30 May 36: Hacca: Ex-Pom with Yarpie Connections [heading] Robert Holmes a Court has substantial business ties with South Africa [GAW4].
1990		Sun-Herald (Sydney) 7 Jan. 128: Tim Fischer, shadow minister of veterans’ affairs, has visited the grave of Breaker Morant in a Pretoria cemetery during a stop-over in Yarpieland [GAW4].
1992		F. Edmunds Samson and Delilah 31: She said she didn't want me growing up sounding like some Yarpie.
2002		Bladder (Aus.) No. 80 31 Dec. 🌐 Sources from within the Australian slips cordon report that the new South African batsman currently taking his guard from the umpire is a filthy stinking yarpie bastard who can’t bat for shit.

2. a Rhodesian.

1997

M. Phythian Arming Iraq 159: He’s a Yarpie — a Rhodesian. He works for the Midland Bank arms department.