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1.
1. Noun reflecting a small nugget of excrement left between the buttocks by rushed or ineffectual wiping, thus causing continued discomfort until it is removed or becomes dislodged.

2. Noun reflecting a person whose presence causes a similar degree of irritation to that depicted in the first definition.

3. Noun reflecting a particularly posh person, educated at "one of the finer” English boarding schools, typically brought up in a mansion in the Home Counties only to spend the best part of their teens and early twenties living at the Chelsea townhouse left mostly vacant by parents who prefer the family home in the country. They can be identified most easily by their tendency to speak with an almost patronisingly nasal slant on Received Pronunciation and their apparent failure to understand anyone that doesn't do the same, regardless of class, nationality or ethnicity. Other tell-tale signs, although by no means uniform, are tailored shirts (often pink), big hair and showy, obnoxious behaviour in the men, and sunglasses (whatever the weather), ugg boots, eating disorders and peroxide blonde hair in the women.

Etymologically, it derives from the adjective chuff, meaning posh, which, in turn derives from chuffed, as in pleased with oneself, since posh English people often come off as quite smug and seem oblivious to the struggles of those who are not upper class. The suffix nut may simply have been added because of the internal rhyme and its meaning as head (ie posh-head), or, perhaps, fanatic (eg film-nut), since chuffnuts seem very much immersed in their own rather small world, often acting surprised when another chuffnut knows someone they know, when, in reality, the fact that they are a chuffnut means they could only have been to one of maybe a dozen prep schools, a further dozen boarding schools and perhaps five universities (Newcastle, Durham, Edinburgh, Leeds & Bristol currently being the worst offenders, although an elite Oxbridge contingent - from which Conservative MPs David Cameron and Boris Johnson hail - should not be entirely discounted).

N.B. It has been argued that the first two definitions could also have contributed to the third, since the blinkered conservative views nurtured by chuffnuts' sheltered existence and the afore-mentioned nasal tone with which they speak (particularly amongst female specimens, where it can manifest itself as rather shrill) can often prove somewhat irritating. However, the claim remains unsubstantiated.
1. “Remember to wipe carefully children, because this is the last service station we'll be stopping at and after eating so many cashews last night, you're liable to end up spending the rest of the journey being bothered by a chuffnut.”
2. “He had a tendency to cling to whatever party guest had yet to learn what a chuffnut he was, or at least, those too polite to tell him just to fuck off. “
3. “When did all these chuffnuts move to Battersea? I just took a walk through the park and saw 3 couples wearing matching pashminas.”

by Trudi July 02, 2008
 
2.
Those particles of shit that stick to the anal hair
Tracy's gone off Darren, she says he had chuff nuts on his arse!
by David from Kingsbury November 07, 2003
 
3.
Origin: my ex, East London
Definition: The hair and sweat from your nether regions teamed up with the fluff from your underwear to create those little fluff hair balls that stick to your arse.
Singular: Chuffnut
Ex: Urgh, I've got chuffnuts.
Me: What the fuck are chuffnuts?

Ex: Look at the size of this chuffnut!
Me: *Disgusted* We have been going out for way too long.
by peachy3000 April 27, 2006
 
4.
A chunk of shit stuck between your ass cheeks. Generally missed if you've been too hasty wiping your ass after a dump.
Man, I only wiped once, and now I have a chuffnut the size of an egg in my ass.
by Stu October 12, 2003
 
5.
A Chuff Nut is when you fart and in the process, slightly shit yourself.
On no...I think I've just fired out a chuff nut
by Rudeboy23 December 18, 2008