All I could find was "chuffed" meaning pleased.
Before you plan to use it, however, one note of caution.
As a verb it can mean "pass flatus".

Never heard it used that way, Bill. The only use of "chuff" I've heard is the adjective form!

Dear Capfka: "chuffed" or "chuff" is not a word I would use
in any case. And as for the scatological part, I got it from a long site about Brit slang.

chuff Noun. 1. Rubbish, nonsense. E.g."That film was a load of chuff."
2. The anus. [Aust.]
3. The vagina.
4. A passing of wind from the anus, a 'fart'.
Also used as a euphemism for 'fuck' in expressions such as the denial - "Did I chuff!"
chuffed Adj. Pleased, delighted. Compare with 'dischuffed' and 'chuffed to buggery'. E.g."I'm well chuffed at the result." [1950s]
chuffed as nuts Adj. Extremely pleased.
chuffed to buggery / fuck Adj. Very pleased. E.g."She's chuffed to buggery that they are marrying before the baby is born."
chuffer Noun. 1. A contemptible person.
2. An annoying, difficult or disappointing occurrence. E.g."It's a right chuffer, breaking my leg just before the football season starts."
Chuffer is a euphemism for 'fucker'.
chuffing Adj. A euphemism for 'fucking'. E.g."That chuffing idiot has scratched my fave record."
chuffin 'ell! Exclam. Euphemism for 'fuckin hell'.

Makes you wonder about the childish name for a steam train: chuff-chuff.

Bingley

the childish name for a steam train: chuff-chuff

Check it out in onelook. That's where most of the definitions center, that and the churlish fellow definition.


Course, among USn kids it's usually choo-choo.

As I recall, it varied round our way between choo-choo, puff-puff, and chuff-chuff.

Bingley