If you go to a category (you can do this by clicking on the category under a question) you will see a short description.
Urban Slang:
"An informal spoken language made up of current coinages, phrases or words that are used in place of standard terms for added emphasis, humor or other effects. Basically, the lingo used by peeps to talk about mad shiz and holla at their homies."
Vintage Slang:
"Groovy terms from the past that's the berries!" - Basically, slang from the past.
"Down the road" is urban slang for a little farther.
The urban slang for "a little farther" could be "a bit more" or "a tad further."
urban slang
Slap
Hennessy
Slang is the only reason that urban dictionary exists.
There is no word "sexisphere" in the dictionary or on the Urban Slang site. It may be regional slang.
This is a very broad question - please click on one of the related questions to look for slang from each decade.
From the Urban Dictionary: Phudi is slang for vagina
Pig Out
iCarly is a show on nickelodeon.
It means awesome or radical.