UK-speak *giggles*

From the Dictionary of English Slang.  Seems like one would need to be very careful about -ff, -ffer, -ffed, -ffed as, -ffed to, -ffing, -ffin', and to whom one is speaking.

chuff	Noun. 1. Rubbish, nonsense. E.g."That film was boring, too long, and generally just total chuff." 2. The anus. [Orig 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!" Verb. To break wind. E.g."She chuffed just as we were saying grace before dinner"
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'.
chuffer (train)	Noun. A train. Children's talk. Also chuff chuff.
chuffing	Adj. An intensifier, and euphemism for 'fucking'. E.g."That chuffing idiot scratched my favourite CD and now it sticks on the third track."
chuffin 'ell!	Exclam. Expressing anger, surprise etc. A euphemism for 'fuckin hell'.