Etymology of "It's been a slice!", "It's been a real slice!"?

[Arnold Zwicky]

On Sep 18, 2013, at 4:41 AM, Hugo <hugovk at GMAIL.COM> wrote:

> "It's been a slice!"
>
> "It's been a real slice!"
>
> A parting shot, usually meaning, "It's been good!"
>
> Anyone know what the slice is referring to?
>
> My own guess is it's a playfully ambiguous suggestion the experience was a "slice of heaven"; or was it a "slice of hell"? Or perhaps, as one example shows, from "a real slice of life", a full experience.
>
> The earliest I found is in the Edmonton Journal (17 October 1979) and used both phrases:

that takes it back further than the cite i found here:

http://arnoldzwicky.org/2013/07/04/its-been-a-slice/

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