Place it right after the boast in your edit, then follow it with Bruh before the next joke. For a bigger pile-on, add Emotional Damage next, or open with Oh My God Bro Oh Hell Nah Man to set up the disbelief first.
About this sound
This short clip is a loud male voice in Portuguese shouting the phrase 'O cara deixa homem mamaaa' with stretched, exaggerated emphasis over about four seconds. It feels brash, absurd and deliberately over the top, like a friend yelling a joke across a room to get a laugh. The delivery makes it instantly recognisable as a Brazilian meme reaction.