Green’s Dictionary of Slang

draftpak n.

[Scot. draftpak, take-away packs of draft beer available over the bar in Scottish public houses]

(Scot.) a lowlife, an eccentric; a habitual drunkard.

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[Scot]I. Welsh Trainspotting 30: Ah’m fed up to ma back teeth wi losers, no-hopers, draftpaks, schemies, junkies and the likes.