1. fo' shizzle my nizzle
Originated in medival England in the 15th century, this phrase has changed in meaning completely, from the orignal shorthand denotation of "Alas! An adversary has come upon us! To the battlements!" to the modern definition of "Please grease up my penis."
Old: Bartholomew, the dastardly barbarians are attacking! Foe Shizle mine nizle!
2. fo' shizzle my nizzle
"fo shizzle ma nizzle" is a bastardization of "fo' sheezy mah neezy" which is a bastardization of "for sure mah nigga" which is a bastardization of "I concur with you whole heartedly my African American brother"