I tried to google it, but all I got is culinary recipes. What does "сушить сухари" mean?

If a russian person says something like I should "сушить сухари" and it's clearly not about food, what could it mean? Does it refer to a joke? Perhaps a popular movie? Perhaps a kid's cartoon? Or an adult cartoon? Or a political incident? Perhaps it is an expression? If it's an expresison what does it mean?

I tried to google "сушить сухари" but all I got is recipes about making bisquits look, like this - https://ru.wikipedia.org/wiki/%D0%A1%D1%83%D1%85%D0%B0%D1%80%D0%B8

and this https://www.youtube.com/watch?v=LYZWQ1ret_Q

is this indeed only about food (bisquits) and doesn't have another meaning?

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    ru.wiktionary.org/wiki/… Nov 3 '19 at 14:17
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    @SergeySlepov is it about PRISON? OMG ok
    – pillarsOE
    Nov 3 '19 at 14:41
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    Yes, it's a common expression meaning "get ready to go to prison". Сухари (dried bread, croutons) is a food that won't go stale for years, something to eat while your doing time. Nov 3 '19 at 14:56
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    @shabunc while specific example would be nice to have, "суши сухари" has a single well-known idiomatic meaning, and that's "Get ready for prison". So I, personally, tend to disagree with the "unclear" label. Nov 5 '19 at 3:37
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    @shabunc I do agree with Ivan Milyakov and would recommend to remove the "on hold" mark from this good question. Nov 7 '19 at 0:58