Proud, or happy, or pleased with ones self or the situation.
Can also mean overly pleased with oneself (sarcastic chuffed) when it isn't deserved, if you're a chav.
Not to be confused with chuff, which can refer to a female's privates, or chuffpipe which can refer to anus/asshole, or chuffer, which is a insult or derogatory label for a person.
I'm chuffed to bits because I've just won 50 quid on a scratch card!
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