Green’s Dictionary of Slang

excl. of annoyance; a general negative retort.

1992		E. St. Aubyn Bad News 66: Patrick clutched his stinging nose. Fuck, wank, blast, shit, damn. It [i.e. fake heroin] was a hideous cocktail of Vim and barbs.
2003		‘Jokes’ on MSNGroups 🌐 Later on the boy went upstairs to find his Dad shaving, he cut himself and said ‘Oh wank!’.