Do you mean saying "cheers" while raising your glass? Then it would be "Kippis!". ("Cheers" as in "thank you" would be "Kiitti".) Or you could use the equivalent for "Bottoms up!", which is "Pohjanmaan kautta!". But "Kippis" is easier to pronounce. =)
Bottoms up
Banat means nothing in Finnish, but bänät is slang for "break up [from a relationship]"
That word is not Finnish.
Pleb is not a Finnish word.
Bottoms Up Club was created in 1971.
You mean Suomi, and Suomi means Finland in Finnish.
"Mitä" (mi - tä) means "what" in Finnish.
It's a finnish word and it means 'sekaisin' , what means messed up in english.
Fins up would be evät pystyyn in Finnish.
"Cheers!" "Bottoms up!" or other equivalents. I assume you mean "proost", broost isn't a Dutch word.
If you mean frost in the ground then it's routa in Finnish.