Translator-san, I believe I can help you with lewd sounds. These are based on my own experiences.
Dame!
Yada!
Tasukete!
Kimochi warui!
Hahaha! Chisaii!
Purupuru pururin pururi-n!
Translator-san, it's "race" not "match". And FYI for everyone, race 11 in Japanese Racing Association meetings are usually the biggest races, with the most money bet. Don't ask me how I know that, let's just say a former life.
Just binged up to this chapter. Hilarious. What characters! I've read Strongest Man Kurosawa by Fukumoto, and it's one of my favourite manga. I guess I'll have to finally get around to reading his other works like Kaiji, Akagi and Ten.