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1.
Adjective; a nickname or word used to describe a very adorable but stubborn boyfriend who knows his amazing girlfriend is right but is always being difficult at realizing this fact.
Girlfriend: Hey Baby! Look at this puppy it's so cute can we keep it?! I wanna name it Tyra <3

Boyfriend: No! We are not naming that dog Tyra. The only way that's happening is if that puppy is brown :)

Girlfriend: But I want a cute white puppy like this one! * shows pic

Boyfriend: no! The brown puppy or nuthin.

Girlfriend: ahhh fine you win Diffy. You're such a Diffy.
af Diffyluver69 30. april 2012
18 3
 
2.
The best friend a girl could have.
he is such a diffy, he gives the best advice!
af shelbsterTROLLOP 10. juli 2008
18 10
 
3.
Spiffy and different
Ooh that boy mike nunn is so diffy!
af Yung beast & Licia 31. december 2009
11 5
 
4.
'Deficient' - missing. Someone being diffy something will have lost of misplaced it. Usually a term related to and used by the British Army.
That soldier's diffy a pair of boots so he'll get billed for the loss.
af reme_critter 18. juli 2011
3 7
 
5.
DIFFY: : lacking needful or desirable substance : weak, ineffectual.

Another word for: Retarded, Lame, Dumb, Boring, Stupid.
"Hey, dude. You going to Nate's party tonight?"

"I don't know, ,man. Last time I went over there it was pretty 'Diffy'."
af Metal Metal Rob Walsh 28. august 2010
4 9
 
6.
A person from the capital of Mexico. D.F. Districto Federal.
OMG did you see that diffy cross the border?
af Stephro 22. februar 2009
4 9