real jam

noun

real jam

noun

1

UK, Slang Anything exceptionally good.

That's the real jam!
It's real jam, that little pictur his . I wouldn't mind springin' the price to a century. There! Shall I send my boy round to tell him so?George Augustus Sala, The Story of Jack the Painter, in 1863, Tales and Essays (volume 3, page 10)

1 more example

It was real jam to see little NORRIS, who was out for the first time, in a horrid state about his four greys.1877, Punch, page 134:

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