Put it at the very end of a win clip, right after the decisive play, so it closes the edit as the final taunt. Follow it with Emotional Damage for the loser's reaction, or cut to Bruh when the opponent tries to argue back.
About this sound
This five-second clip captures a young boy shouting that he has beaten you, then breaking into a high-pitched, breathless muahahaha that sounds like a cartoon villain celebrating far too hard. The laugh feels gleefully unhinged and proudly unserious, turning a simple taunt into something instantly funny rather than threatening, and it works because the kid sounds completely convinced he has pulled off the ultimate win.