Braap is the written imitation of a dirt bike engine under hard acceleration, a bit of motocross slang that has been used for years on forums, stickers and riding videos. Repeating it as braap braap turns that single rev into a recognisable double burst, which is why editors use it as a shorthand for speed even when no real bike is present. Online it now appears far beyond racing, dropped into memes, gaming clips and short videos whenever anything small or slow is edited to look suddenly fast and powerful.