arsewaysadv.
/ˈɑːsweɪz/, U.S. /ˈɑrsˌweɪz/ coarse slang.† 1. With reference to sexual intercourse: from behind. Obsolete. rare.
ΚΠ
1909 J. Joyce Let. 8 Dec. in Sel. Lett. (1975) 184 I am delighted to see that you do like being fucked arseways.
2. The wrong way round; back to front; backwards. Cf. arsewards adv.
ΘΚΠ
the world > space > relative position > inversion > [adverb] > reversed or turned the wrong way
awkward1340
backwarda1475
wrong-way1693
reversely1752
reversewise1800
wrong-wise1849
back to front1869
hindside-foremost1929
arseways1938
1938 E. Anderson tr. W. A. Mozart Let. in Lett. Mozart & Family II. 495 I..played..the theme over again, but this time arseways.
1981 Rev. Contemp. Fiction Spring 169 O'Brien was no great respecter of characters, and, turned sideways or arseways, they quickly reveal themselves as one-dimensional.
2016 Irish Mirror (Nexis) 5 June Art used to imitate reality, but now sadly we've got it arseways.
This entry has been updated (OED Third Edition, September 2018; most recently modified version published online December 2021).
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adv.1909