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1.
An expression showing disbelief or incredulousness.
The country rapper, Riggity Right shot a horse after singing his triple platinum single "Pimps n' Horses." The crowd exclaimed that the performance was riggity tight.
by Laurel January 18, 2005
 
2.
Right, like the direction! Used to avoid confusion: "Right?" "Right!"
Bust a phatty riggity, Bob!
by defythereds July 26, 2003