\nFlibbertigibbet is a noun the come from late Middle English.It means,\na frivolous, flighty, or excessively talkative person.\n.
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\nSource: Oxford American Dictionary
It's a name and it doesn't mean anything. It's the name of one of the demons which Edgar, while pretending to be the madman Poor Tom nin the play King Lear, claims is haunting… him. Five fiends have been in poor Tom at once: of lust, as Obidicut; Hobbididence, prince of dumbness; Mahu, of stealing; Modo, of murder; Flibbertigibbet, of mopping and mowing, who since possesses chambermaids and waiting women.. (MORE)