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From The Collaborative International Dictionary of English v.0.48:
guff \guff\ n. 1. A ludicrously false statment. [WordNet sense 1] Syn: bullshit, bull, Irish bull, horseshit, shit, crap, bunk, bunkum, buncombe, rot, hogwash, dogshit. [WordNet 1.5] 2. Insolent or disrespectful talk; as, don't give me any of your guff, young lady. [PJC]