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short for "most definitely" (contrary to popular belief it is NOT mo def, and whoever said that is fucking retarded), used because saying most definitely sounds gay and mo defs sounds cool
Kid 1: dude that girl is so hot
Kid 2: most definitely
Kid 1: wtf
Kid 2: Uhh I mean mo defs
Kid 1: true dat
Kid 3: mo def
Kids 1 and 2: ...
Kid 1: shut up dumbass
mo defs by disneysucks December 3, 2006
Related Words
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.
fo defs by jimjimjimjimjimjimjim December 26, 2010
"I'm defs keeping this on the DL."
"Are you going to John's tonight?" - "Defs."
defs by coolkidddd September 12, 2006
A shortened word for definitely
She is defs the hottest girl out
Defs by cwperson October 4, 2011

defs fo sho 

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.
- "Sometime in the future, we're going to that Harry Potter amusument park."

- "defs!!"
Defs by letsTPtheplace July 8, 2010