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1.
A reference to the original teller of a joke, story, etc.
Man 1: So I told the hearse into a bar joke yesterday
Man 2: Hey I told you that.
Man 1: Ya, I footnoted it.
by beoheed September 22, 2007
 
2.
100$ bill
Nigga i bought a Q for a foot note.
by Subb$ Swaggin December 08, 2010