Put it at the end of a setup, just after the neighbour gag peaks, then follow it with the Bruh sound for a second beat before Emotional Damage closes the joke with a bigger reaction.
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This is a very brief vocal clip saying 'Boy Next Door' in a blunt, flat delivery, lasting just over a second. It feels abruptly absurd and knowingly silly, like a sudden punchline for viewers who recognise the joke. It comes from Gachi meme culture, built around Billy Herrington clips that spread through remix communities in the late 2000s and 2010s.