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It's an acronym for Delete your Facebook. The proper use for dyfb is when one says something that you find offensive or just flat out dumb one would respond with dyfb or delete your facebook.

It works on many levels due to the fact that facebook is such a social norm that without one you basically do no exist. It's almost like telling someone to shutup or to go die.
Boy 1: I just tripped up the stairs
Boy 2: dyfb

Girl 1: I'm so in love with my boyfriend!
Girl 2: It's been like two weeks, just dyfb.
by ayyjosh July 02, 2011
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Jul 13 Word of the Day
a phrase chiefly used in northern England.

it is a contracted form of "it'll be reet", where "reet" means "alright" or "OK".

living your life according to "be reet" is the only way to find happiness in life.
Geoff: "ZOMFG a just hopped off the buz n me 'ouse is burnin' down n me Deirdre's in there dyin!"
Jack: "Be reet."
by Tommmmmmmmmmmmm May 06, 2007
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