Yow!

Yow!

(exclamation)
/yow/ (From "Zippy the Pinhead" comics) A favoured hacker expression of humorous surprise or emphasis. "Yow! Check out what happens when you twiddle the foo option on this display hack!"

Compare gurfle.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
References in classic literature ?
"Hi-yi-yi-yi!" sang Vixen as we shot round the curves; "Toot-toot-toot!" went the driver's bugle at the dangerous places, and "yow! yow!" bayed Garm.
But if you have swimmer's ear and you stick your finger in your ear -- YOW! Let's find out more about this painful type of ear infection, which often affects swimmers.
3 YOW! Our 49-year-old cosmetic surgery-loving star quite clearly doesn't give a nip/tuck about the state of her stumps.
As it is, gay audiences will probably remember the film most for a line of Anthony Hopkins's narration following a boyhood wrestling match where Hephaistion bested Alexander: "It was said later that Alexander was never beaten, except by Hephaistion's thighs." Yow!
Now, how many of you just involuntarily crossed your legs and went, "Yow!"?
Yow! The new 20-gigabyte version of this compact disc player-sized device holds 340 hours of music.
Laboratories Inc., describes the company's YOW! Breath Freshener, which it has been selling for a little over a year.
"There's nothing else like it on the market," he says, pointing out that the YOW! tablet provides many of the benefits of a toothbrush, toothpaste, mouth rinse, whitener and breath freshener.
YOW! also whitens teeth without bleach or peroxide and lifts stains from coffee, tea and tobacco, he points out.
YOW! was released in February 1997, Gunther says, and is now in about 14,000 retail outlets, including those operated by Eckerd Corp., Rite Aid Corp.
Still, it's Fin I feel sorriest for - as if looking like Sol Campbell's uglier, older brother wasn't bad enough, he's condemned to shout "Yow!" every time he wants to speak to Comfort and is generally forced to behave like the kind of ludicrous black caricature normally only seen in The Crouches.