yiff

As an abbreviation iff

is if and only if; used to show that the truth values of two statements are the same.

As an initialism IFF

is interchange File Format, a file format standard developed for Amiga computers.

As an interjection yiff is

representing the bark of a fox (especially while mating).

As a noun yiff is

a bark.

As a verb yiff is

to bark (said of foxes).

As an acronym YIFF is

young, independent, freedom-minded few (compare yuppie.

As an acronym yiff

is young, independent, freedom-minded few (compare yuppie).

As a noun miff is

a small argument, quarrel.

As a verb miff is

(usually used in the passive) to offend slightly.