Like "Mos Def" or "Fo Sho".
A combination of the "for" from fo sho and the "definitely" from mos def, as in "Most Definitely."
"Tried that new demo yet?"
"Fo def; it was awesome."
by shwingshwang January 07, 2008
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A contraction between the word definitely and the phrase "for sure". Used as assurance, reassurance, confirmation, acceptance, affirmation, encouragement, agreement, and many more.
Jim: let's order a pizza and watch Terminator 2 tonight.
Joey: fo defs.
by jimjimjimjimjimjimjim December 25, 2010
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originaly a typo on aim a combonation between for sure and definatly or def. now it is a word that is ten times better than both of those words
man that movie was of the hook
yeah fo def.
by Kyizzzzie April 19, 2006
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the chillest way to abreviate "definitely for sure" I would recommend using it, especially if you're bro.
Guy 1: I want some nattys.

Guy 2: Defs fo sho, bro.

Broseph: I got some dome from that chick the other night. It was chill.
Broski: Defs fo sho.
by So bro, you can't handle it. February 16, 2011
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