The word "cube" in 60's slang was a continuation of the description of people as "squares". A square was someone who was not "hip" or who had a dislike for the counterculture or Hippies. Someone who was described as a "cube" was so totally out of touch with popular counterculture that they exceeded the "square" description. "Those girls aren't just squares, they are a bunch of stressed out cubes".
The typically UK slang is gobsmacked (shocked or dumbfounded), from the 1960s era military slang, itself from the Irish word "gob" for mouth.
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It is the Yiddish word for a woman who is not Jewish. It is slang in English, but it is not slang in Yiddish.
Dough is a slang word for money.
Cool itself, unless you are using it to mean mildly cold, is a slang word. Just because it is old slang doesn't mean that it is not still slang.
"Shrink" IS a slang word. It means a psychiatrist. Unless you mean "TO shrink" ...
BTM is a slang acronym for "Be There Moment."
Tat is also slang for tattoo
Potted is slang for very drunk.
Nothing. It is a middle east country. Not a slang word.
Grog is a slang term for alcohol.
Snow is a slang name for the drug cocaine