If you look up “slang” in your dictionary, you probably come up with the following or something like this:
The above excerpt comes from The Random House College Dictionary (published in 1975）.
In short, slang is a group of words editors don’t want to place in their dictionaries or they cannot find at the time of printing.
In a sense, if you can find some words in your dictionary, those words are not slang at all because they are well accepted in our society.
The words described here are not found in the above dictionary.
You may say, the dictionary published in 1975 is too old.
During the past three decades, some foreign words sneaked into English as slang, others were coined, yet others started to have some vulgar meanings.
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Veteran hack director Sidney J. Furie directs the silly straight-to-video comedy Rock My World. The aging stuffy English aristocrats Lord and
Lady Foxley (Peter O'Toole and Joan Plowright) have fallen on hard
times, so they loan out the use of their mansion to the American rock
band Global Heresy. When the band's bass player mysteriously
disappears, Nat (Alicia Silverstone) shows up to replace him.
Then the servants don't show up, and the Foxleys are forced to
pose and a maid and a butler in their own mansion. The culture
class between the conservative English and the reckless Americans
is played for comedy, leading to an ending where the power of rock
& roll transforms both cultural groups.