A complimetary phrase, if applied in a positive sense (chuf up), given by someone if they see someone else do something that is funny/cool/really stupid.
Also an insult if applied in a negative sense (chuf down), if someone commits an act that is agreed by the surrounding people to be gay/douchy/fagatronic.
Also a rating scale. By "chuffing up", you increase your chuf rating on a scale that ranges from -6 to 6. If you have negative chuf, like Gary Miskovsky or Oprah, you are a dick.
<person commits an interesting/funny act>
a person can also be defined by a chuf rating-
"That kid Gary is a negative 6 chuf"
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