'Sä voit syödä pienen biitin tota, mutta jos syöt sitä paljon, saat ruokamyrkytyksen. -Okei.'

I only found the translation beat (biiti) for biitin, nothing else. That doesn't fit here at all, so the question is it a kind of finglish and means a bit? This would fit perfectly: (You can eat a little bit of this, but if you eat a lot of it, you'll get food poisoning. -Okay).

See a translation

@mozzyrelly
Kiitos paljon!
I have made the experience that when I cannot find an explanation in any of my sources (and there are now many), there is often an English word behind it. Recently I found the word älpee. I was desperate, it actually looked very Finnish and I thought what is it, I can't find an explanation anywhere. Until I suddenly realised that it could simply be the Finnish phonetic version of the English LP.
And I haven't done that yet, but it might be a good plan to look in a Swedish dictionary. I already had some Finnish words that came from Swedish. But they were almost always in Finnish dictionaries.
Before that, I had a Finnish word that is almost identical to the German word: Kalenteri (calendar). There are many more Finnish words that are similar to German (I think there are over 100) than I thought at first. I wonder where this comes from and I haven't found a satisfactory answer yet.

@mozzyrelly
That's very interesting, I will pay more attention to the etymology of words I like in the future. Maybe I'll even make a small file where I can find Finnish words that have Swedish roots. I have also come across words with Russian origins in slang. No wonder, since Finland has a long border with Russia.
I don't see any similarity between school and koulu - for me they are completely different words, they have only one letter in common.
What I meant by German words are words that are almost identical. Let me give you some examples:
Melone meloni
Museeum museo
Kollege kollega
Keks keksi
Konzert konsertti
Katastrophe katastrofi
Artikel artikkeli
Alkohol alcoholi
aktiv aktiivinen
Animation animaatio
Banana banaani
Benzin bensiiini
Biologie biologia
Bus busi
Dokument dokumentti
Vitamin vitamiini
I could go on with this for a long time. I have already collected almost two hundred examples, although I only write them down occasionally. Every German would understand these words immediately. In the case of koulu, probably no one would understand the word unless they knew Swedish and could derive it somehow. But I think that's difficult. If you swap only two vowels and write kuolu, it has a completely different meaning for Finns and for a German it looks quite similar again. (By the way, this happens to me very often that I am no longer sure in which order the vowels are. Although I have read koulu very often, I may write kuolu by mistake).

I wonder where these words come from that are identical or almost identical?

@mozzyrelly
Just as we are discussing etymologies, I discovered a new word: Kaamos = Polar Night. It comes from the Northern Sami skábma, and is also derived from the Norwegian skamtid.
I have not yet knowingly come across Norwegian influences.