And Daniels Jackson, half a fifth
“A Fifth” refers to a fifth of a gallon of liquor (757 mL). This term is typically used to denote containers of liquor holding 750 ml, which isn’t technically a fifth of a gallon.
So, “half a fifth” refers to 375 ml of Jack Daniels (“Daniels Jackson”—apparently Purp is too drunk to get the name right), or about half of the bottle picture below.
The “half a fifth” reference matches lyrically with the “half a zip” and “half a flat” allusions that come before it. It appears he’s driving drunk as well as preparing to smoke some weed!
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