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1.
A slang word that is a synonym, or similar to, another slang word.
Swag has many Slangonyms, such as fresh, style, fly, and awesome
by Charles L. Greenfield June 05, 2013
 
2.
a word whose slang definition is similar to another word, while its standard definition is not.
"'Sick' is a slangonym for 'awesome,' but they aren't synonyms."
by noyoureapseudonym June 13, 2012