One of the few slang words I’ve been able to discover that have been created recently, as in just in the last 20 years or so, is the word naspa (nosh-pah).
What’s interesting about naspa is that it is identical to a non-slang word, nasol, which just means anything ugly, unpleasant or of “low quality”. In other words, anything you don’t like is naspa or nasol, both words deriving from a Gypsy word nasvalo meaning “sick” or “bad”.
The word nasol though, not being slang, is declined normally, meaning it has a female (nasoala) and male version (nasol) as well as different plural endings. The word naspa however, being slang, is generally NOT declined and is the same form whether female or female.
Again, naspa is slang while nasol is not and yet they mean identically the same thing. Your grandmother might chew you out for using naspa though, so be careful!
AND NOW YOU KNOW!