What is a 'jar of malt'

[Nelli]

In Justin Timberlake's song, what is a Jar of Malt?

[seb brown]

Bottle/ glass of whisky me thinks.

[Lozzer]

Yeah thats right, malt whisky. The jar is another name for the glass, like in the song 'whiskey in the jar'

[IndieSinger]

Where I live, all glasses containing alcohol are known as jars, especially pint glasses. So you might hear people say, "How many jars have you had tonight" or "Are you out on the jars later?".

[Lisa-Marie]

I thought malt was the powder thats added to whisky and vinegar to make it 'malt whisky' or 'malt vinegar'