In urban dictionary, theres a "+" icon next to a "arrow switch" icon on the upper right. Tap on it and you get to this page called "new word"
Tap on
the blank textbox with "word" on it and now add the word or phrase that is on your head
Next is to put your slang definition in the "type your definition here" textbox
In urban dictionary, words in this website are often defined as a "slang" meaning the definition is not the actual definition of the word. Example is
Word:
LasagneSlang definition - pussy of a woman
Real definition - Lasagne, or the singular lasagna, is an Italian dish made of stacked layers of thin flat pasta alternating with fillings such as ragù and other vegetables, cheese, and seasonings and spices such as garlic, oregano and basil.
Lastly is to use the word or phrase you typed in a sentence. (Put it in the "type an example on how it's used in a sentence" textbox)
("Lasagna" is one of
the best parts of a woman)
Some other things you can do or not do is to add tags or a gif to your definition