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1.
We Don't Fuck Around - this was used throughout the 1980s as the motto of the band Van Halen. If you look at old tour books you can see these letters stenciled on their gear cases.
Hey, Dallas, we're happy to be here - WDFA!
by Sudden Steve August 13, 2007
 
2.
wdfa is an acronym for the phrase "we dont fuck around".
"wdfaaatm" we dont fuck around about ass to mouth
by andrew bates September 16, 2005