wryyyyyyyyyyyyyyyyyyyy
A battle cry typically given off by vampires throughout JoJo no Kimyou na Bouken, notably Dio Brando.
It's also shout by Dio after delivering the finisher of his ZA WARUDO (a.k.a. "The World") supermove. Paired with a leaned-back, knees-bent, pseudo-pelvic-thrust sort of stance (think DBZ-style power-ups in the other direction).
The twenty (20) "Y"s are derived from the stick figure Flash animation (see: Danbooru post #107964) that made the move all the more infamous across the Internet.
Dio's son, Giorno Giovanna, also uses this battle cry.