expressing triumph, approval, or encouragement : Wakacha! Great, Mellam!
ORIGIN early 2000s: perhaps an alteration of wakakaka .
expressing success, in a user's words, "wakacha is like wakaka with a touch of magic!"
Very flexible, can be used in many ways.
Could be variation of "Taadahh!!"
coined by Mel Lam
"I got to the end of the sentence!"
or on its own - "WAKACHA!"