Green’s Dictionary of Slang

(Aus./US) stark naked.

1936		in J.M. Hone WB Yeats 1943 480: There she was, saving your presence, bollicky naked.
1947		(con. 1944) J.H. Burns Gallery (1948) 154: I [...] persuaded the Fatima to let me take pictures of her, bollocky.
1992		K. Lette Llama Parlour 145: He was completely naked. Starkers. In the bollocky.
2001		Guardian 8 June 🌐 I was standing there bollocky naked, and I was announced. I didn’t have time to get dressed and I thought, well, I’ll just go for it. So I went on bollocky naked.
2001		S. King Dreamcatcher 138: This year’s Tiger Homecoming Queen isn’t bollocky bare-ass.
2008		P. Theroux Ghost Train to the Eastern Star 30: I saw some people on the island of Tanna standing and squatting, bollocky naked, wearing only penis sheaths.