Abbreviation of "Fo sheezy my neezy" which is a bastardization of "Fo shizzle my nizzle," which is a bastardization of "Fa Shoh mah Niggah," which is a bastardization of "For
sure my Negro" which is the bastardization of "I concurr with you, my
African Brother."
Specified from KungFuJesus Apr 28, 2003 suggestion.