Sir Lucius, with the left foot, is ready willing and able

from Youngbloodz (Ft. Big Boi) – 85 Lyrics on Rap Genius

Meaning

Sir Lucius Left Foot is another alias of Big Boi and he’s ready for some action!

Sir Lucius Left Foot was also the name of Big Boi’s latest album.
http://en.wikipedia.org/wiki/Sir_Lucious_Left_Foot:_The_Son_of_Chico_Dusty

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