Green’s Dictionary of Slang

raas! excl.

also rarse! rass! my raas!
[? f. phr. your arse or Du. raas, to rage, to rave; one of the most taboo words in the W.I., it has been banned from public use in the majority of islands]
(W.I./UK black)

an all-purpose abusive term.

[UK]A. Salkey Late Emancipation of Jerry Stover (1982) 36: ‘Pure wickedness, man!’ Berto said. ‘Sweet rass!’.
[UK]R. Hewitt White Talk Black Talk 141: Fucking rass! Rass bamba!
[WI]S. Selvon Eldorado West One 20: Oh rarse! That look like my mother!
[UK]C. Newland Scholar 43: Checkmate my raas!
Skins ser.1 ep.3 [TV script] Raas! Duck out, waste gash.

In exclamations