Green’s Dictionary of Slang

packy n.1

[dial. packy, the calabash fruit, which resembles the human head]

(W.I.) the skull, the head.

[[US]H.G. Murray ‘Tom Kittle’s Wake’ in D’Costa & Lalla Voices in Exile (1989) 96: A ‘packy’ or small calabash cup was held underneath, into which the blood trickled].
[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980).

In phrases