half-jack

half-jack

n
(Brewing) informal South African a flat pocket-sized bottle of alcohol
[C20: jack, probably from C16 jack a leather-covered vessel, from Old French jaque, of uncertain origin]
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I can't vouch for all those swanky private clubs, obviously - there must still be enclaves of stringy gym bunnies in fluorescent thongs out there somewhere - but down at our good old council-run facility, it's bits all-a-wibble and old-kit-a-go-go which, as someone who cringes at the very thought of confusing my knee lift with my half-jack while flailing amid a sea of taut-buttocked lovelies in designer gear, goes down a bomb, I can tell you.