Definition
That crusty, dried-out blob of mustard that forms at the tip of a squeeze bottle, waiting to ruin your hot dog presentation. It's the condiment world's equivalent of morning eye crust—nobody wants it, but physics insists it must exist. Always perform the pre-squeeze safety check unless you enjoy mustard grenades.
Example Usage
I had to flick off the mustard booger before putting any on my sandwich because I'm not a barbarian.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=mustard%20booger&defid=17009)
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