What were once nonsensical words often, with enough common usage, enter the English language. But even once it’s included in a dictionary it may for a long time before it becomes more than just slang and is more broadly accepted. One such recent case is the word “muggle”, a word coined by Rowling on the Harry Potter series. Thus, I have two questions.
First of all, what are some slang words that have become more or less acceptable. For instance, would a word such a “groovy” be included in this category?
Second, what are some of the latest (non offensive) slang words you’ve heard and what are their meanings and/or origins? This may include old words that have come back into fashion and brand new ones.
I'm American, and this word is used all over the world in present times, but if I remember correctly, it was once considered extremely derogatory:
Cop
When I was growing up in the 1970s, my mother vehemently corrected me for referring to a police officer as a 'cop'. Nowadays, it's universally accepted.
Slang words 
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