uff yaa 

Expression uff yaa comes from the cheating community in eSports games (such as Counter Strike). Dating back to year 2009, uff yaa has became a commonly used expression in the HvH (hacker vs. hacker) scene in a video game called Counter-Strike: Global Offensive. Expression was used publicly for the first time in 2009 by a Kroatisch Counter-Strike player, root, who started selling his cheat under the moto "We can and we will, uff yaa $"

/* Example in a chat */
Person 1: dude we dropped his ass like a waterslide
Person 2: uff yaa $

uff yaa by skrrt November 26, 2016