Any noun, verb, adjective, or adverb.
(I find it absolutely incredible that someone else actually put Flauff in here already, and that it basically has the same meaning. I've been saying this word for almost ten years, ever since a friend of a friend thought he heard it on the radio, it was used to block out "fuck" I believe.)
Watch out, that flauf is moving pretty fast!
We should flauf to the store and get some cottage cheese.
That flaufin hot air balloon is on fire and coming right for us!
The old man spit flaufily into his spitoon and remarked, "If I ever flaufed a flauf that didn't flauf, then color me flaufed!"