An all-purpose swear with no fixed meaning. Chiff-head (mean person), chiff-for-brains (stupid person), pile of chiff (useless), chiff-off (get lost, go away), to give a chiff (to care), chiff-you (general aggression), what-the-chiff (exclamation of surprise), chiff box (unpleasant, unliked, and full of chiff)…

Matt says:
See also chiff.
The multi-purpose active form of chiff. Chiffing hell (exclamation of surprise), abso-chiffing-lutely (yes and then some), no-chiffing-way (nope, nope, nope), all the chiffing time (always)…
Matt says:
See also: Chiff
1. To make a mess of things through error. “You really chiffed it up this time”.
2. To pay. “Time to chiff up or ship out”