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shortened version of "most definitely," making the phrase easier to say, less pretensious, less poser-ish, and works well in texts
I would mosdeff go to the concert, but my sister was a slor, so my mom grounded her and i can't get a ride.
mosdeff by huhwhat?56 January 20, 2009
Related Words
It means 'most definately'
Q. "will you make it tonight? "
A. "mosdef "
mosdef by mitta lee-alle "hannah" August 11, 2010

mosdefleet 

To be "Most Definently Elite".
Used an an adjective.
see also "Defleet"
"That was a tight game, mosdefleet imo"
mosdefleet by Matthew P May 24, 2006