Sounds more like a slur on the Irish.
Bigger, Cigger, Digger, Figger, Gigger, Higger, Jigger, Kigger, Ligger, Migger, Pigger, Quigger, Rigger, Sigger, Tigger, Vigger, Wigger, Xigger, Yigger, Zigger.
Because they are just wayyy too close to sounding like "Nigger."
Is that a reference to the ... what's it called, "The Great French Fry Phantom"?