nasal demons
Recognized shorthand on the Usenet group comp.std.c for any unexpected behavior of a C compiler on encountering an undefined construct. During a discussion on that group in early 1992, a regular remarked "When the compiler encounters a given undefined construct it is legal for it to make demons fly out of your nose" (the implication is that the compiler may choose any arbitrarily bizarre way to interpret the code without violating the ANSI C standard). Someone else followed up with a reference to "nasal demons", which quickly became established. (see Jargon)
The Urban Dictionary Mug
Wish it had the example text as well, but I loved it anyway

It’s great to be able to create your own mug.
My name is is Geet and literally this is literally a gem of a souvenir to have with me XD.
I love to put my lips on this in the morning
this mug got me hard
greatest mug ever.
I Loved The Cosmic Animates Mug. 10/10
Great cup. Thanks for personalizing the message
I did not order anything, and got a stupid cup
this is my new piss mug
Cool
I got this for my dad but he didn’t want it so he just gave it to me. Ever since I took it back my life has been the greatest it’s ever been. I asked my other dad if he wanted but he said no too. Oh well, I get to enjoy this product for myself more.
It was the greatest mug I've ever ordered :skullll
This mug has made me so happy. This is more than I could have ever wanted in life.
My friend loved it.!!
I like it, but not a lot. Also, the mugs are overpriced.
i luv it! great quality and actually the same hight as mossoflife!
Loved it, my co-workers liked the mug.
best mug every i get to wake up every morning to sip out of my sexy lama mug
I really like this mug. It’s quite bizarre and helps me live a quiet life in my small town of Morioh, Japan.
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