GUFF
bunk, bunkum, buncombe, guff, rot, hogwash
(noun) unacceptable behavior (especially ludicrously false statements)
Source: WordNet® 3.1
Etymology
Noun
guff (countable and uncountable, plural guffs)
(informal, uncountable) Nonsensical talk or thinking.
(informal, uncountable) Superfluous information.
(informal, uncountable) Insolent or otherwise unacceptable remarks.
(slang, countable) A fart; act of breaking wind.
Synonyms
• (nonsensical talk or thinking): balls, bull, bulldust, bullshit, crap, nonsense, rubbish, tripe
• (insolent or otherwise unacceptable remarks): brass neck, cheek, impudence, insolence, lip
Verb
guff (third-person singular simple present guffs, present participle guffing, simple past and past participle guffed)
(slang) To fart.
(slang) To mislead.
Synonyms
• (break wind): See also flatulate
• (mislead): To bullshit
Source: Wiktionary