Urban Dictionary is more for slang, coined words, ghetto slang (ebonics), teenspeak, regional colloquialisms and other neologisms that are defined for the benefit of others (preferably with some wit and humor).
MISOGYNIST (UrbanDictionarytard definition): A woman hater.
MISOGYNIST (slang definition): A man who wins an argument with a feminist.
RACIST (UrbanDictionarytard definition): Someone who feels racially superior, and exercises prejudice or negative attitudes towards people of a different skin color.
RACIST (slang definition): A statement of surrender during an argument.
When two people are engaged in an acrimonious debate, the one that first says "Racist!" has conceded defeat. Synonymous with saying "Resign" during a chess game.
"Racist" acquired this new meaning when debaters (predictably) used the term as an argument of last resort. (They couldn't prevail against logic, truth, and common sense, so they played the race card to try and eek out a victory).
CLOWN (UrbanDictionarytard definition): a circus performer known for their comic antics, exaggerated physical features, brightly colored costumes, and heavy use of stage make-up.
CLOWN (slang definitions): 1. A person who is humorous without intention, therefore is a dumb mutha.
2. A girl who covers herself in so much makeup, the true flesh of her face is difficult or impossible to see.
Do you see the difference in these examples???