Green’s Dictionary of Slang

biggitive adj.

[SE big; var. on biggity adj.]

(W.I.) bumptious, pushy, showing off; thus biggitive with yourself, self-satisfied.

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[WI]Allsopp Dict. Carib. Eng. Usage 99/2: biggitive [...] Uppish, bumptious; wanting to be seen to be respected by others.