The highest possible degree to which one can be Def. The is no higher level possible to which one can be def, therefore mos def is the epitamy of defness. There is only one known person to have achieved a true mos def status, that person, formerly known as Date Terrel Smith, then adopted the name of Mos Def upon pushing through the plateau. This level of deafness is the epitamy of hip hop culture.
At one point in my life, i believed that i could possibly be mos def, unfortunately after further review i realized that i was just a trick ass mark.
by Pappa Horace November 07, 2007
As coined by the legendary rapper himself, "Mos-Def" refers to a thing, person, experience etc which is "mos" (or most, hugely, a lot), "def" (excellent, awesome; NOT short for 'definitely').
Mos-Def's changing his rap name to "Yasiin"?? Don't sweat it, he's still the MOS DEF rapper out.... after Chuck D of course..
by LittleRedFox.com.au September 28, 2011