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It means "for sure" or "ya" and sometimes when used with enthusiasm in the voice it can mean "You know it!"
"Hey dude i just got two tickets for a basketball game tomorrow! You wanna go?"

"Fo Shigitydigity-Doo man!"
by Ajexo July 24, 2008

Words related to Fo Shigitydigity-Doo

digity doo fo fo show shigity