Definition
That trusty fallback snack you bring along when trying something new—a safety net in cookie form, just in case the experimental option disappoints.
Example Usage
I'll try these matcha cookies, but I'm bringing a back up biscuit in case they're terrible.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=back%20up%20biscuit&defid=5703503)
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