Green’s Dictionary of Slang

nonsense! humbug! rubbish!

1812		Vaux Vocab. of the Flash Lang. in McLachlan (1964) 226: bender: an ironical word used in conversation by flash people; as where one party affirms or professes any thing which the other believes to be false or insincere, the latter expresses his incredulity by exclaiming bender! or, if one asks another to do any act which the latter considers unreasonable or impracticable, he replies, O yes, I’ll do it – bender; meaning, by the addition of the last word, that, in fact, he will do no such thing.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1859, 1860		Hotten Dict. of Modern Sl. etc.
1864, 1867, 1870		Hotten Sl. Dict.