Green’s Dictionary of Slang

tear someone up for arse-paper v.

also chew someone up to arse-paper, rip someone up for arse-paper, tear someone up for dunny paper
[SE tear up + arse n. (1)/dunny n.2 + SE paper]

(mainly N.Z.) to scold, to reprimand, to attack and totally overcome in an argument; thus ext. as well, I’ll be torn up for arse-paper!, an excl. of surprise or disbelief.

[UK]‘J.H. Ross’ Mint (1955) 98: The slow ones [i.e. recruits] are haggard with being chased and chewed up (to arse-paper, as we say). [Ibid.] 113: I won’t take it out of you urks just because my bollocks were chewed to arse-paper.
[UK]D. Davin For the Rest of Our Lives 300: ‘Well, I’ll be torn up for arsepaper,’ said Pat Murphy.
[UK]G.W. Target Teachers (1962) 276: Finished tearing me up for arse-paper yet?
[NZ]M. Shadbolt Once on Chunuk Bair (1990) 38: I should tear you up for arse paper [DNZE].
[NZ]B. Richards A Pioneer’s Life 86: The irate gardener was bad enough but when his spouse appeared [...] she narlhy tore me up for dunny paper [DNZE].
www.labournet.org June [Internet] Angus McLagan would put his arm around Benny as though they were mates, but Benny knew McLagan had sold out. Benny could’ve torn him up for arse paper.
www.supababs.supanet.com [Internet] Krusher Kemp finally breaks the goalie, lashing in Buckfast’s 1st goal of the season and its fucking game on – lets rip these cunts up for arse paper.