derf definition July 22, 2017 AZ Dictionary Link to this page adjective: strong; effective; tough Strong; effective; fierce. View More others: Bold; brave; powerful; great; terrible. Related Sources Definition for "derf" strong; effective; tough View More Sentence for "derf" And here's to you "derf" cute… View More Synonym for "derf" strong View More Urban Dictionary for "derf" the act of gettin fucked up,… View More How would you define derf? All the definitions on AZdictionary were written by people just like you. Now's your chance to add your own! Your Full Name Your definition Post Definition
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