Definition of "fuzz"

His cheeks were like peaches, with much the same sort of fuzz over them.

1895, Hamlin Garland, Rose of Dutcher's Coolly, page 352

...scientific advances happen more often at the frontier of representation, at the edge of resolution where an image dissolves into fuzz and blur.

2010, Iain Boyd Whyte, Beyond the Finite: The Sublime in Art and Science, New York: Oxford University Press

"Fuzz testing" or "fuzzing" is a technique for software testing that provides random data ("fuzz") to the inputs of a program.

2008, Asoke Talukder, Manish Chaitanya, Architecting Secure Software Systems, Boca Raton: CRC Press, page 94

This gives a good soft clipping effect and a good fuzz sound.

1994, R.A. Penfold, Music Projects, Boston: New Tech, page 33

I think I'm in a fuzz, and don't know what I ſay, I never ſaw the like.

1784, Jonathan Swift, “Journal to Stella”, in The works of the Rev. Dr. Jonathan Swift, page 54

So I'm in a fuzz of not knowing what to do

2016 February 10, Ally, “Signs of an Online Dating Scam”, in Christie Hartman Ph.D.‎, archived from the original on 26 October 2016, Comments

Or maybe my mind was just fuzzed with the drink.

2004, Quintin Jardine, Alarm Call, London: Headline

Sulley works by fuzzing the first fuzzable field to be fuzzed. While it is iterating through all the values it wants to try for that field, all the other fields are untouched and remain at their default value.

2012, Charlie Miller, Dion Blazakis, Dino DaiZovi, iOS Hacker's Handbook, page 172

Let's get the hell out of here before the fuzz turns up

2009, The Imaginarium of Doctor Parnassus, 0:26:17