have (or want) jam on it have (or want) some additional pleasure, ease, or advantage.
1974Olivia ManningRain Forest Hugh…was free to leave at six…Pedley…said: 'You've got jam on it: walking home in the sunset.'
jam tomorrow a pleasant thing which is often promised but rarely materializes. British
☞ This expression comes from Lewis Carroll's Through the Looking-Glass (1871): 'The rule is jam tomorrow and jam yesterday-but never jam today'.
money for jam: seemoney.
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