Grue
Comes from the Old English verb for "shudder" (presumably the origin of the modern word "gruesome" as well; literally "shudder-some"). Grues are creepy, sinister creatures from the Zork series, the oldest and most influential of the old text-based adventure games. They're hardly ever seen because they despise light and only emerge in areas of complete darkness, where they prey upon adventurers and enchanters. Easily pissed off and vicious, they're repelled by even the faintest glow of light; meaning that a simple torch can be enough to keep the grues at bay. They're mysterious; short of their glaring eyes and sharp fangs-and-teeth, nobody knows what grues look like, exactly. They're known for their constant slaving and gurgling, and especially their nasty tempers. In the game's feedback display itself, the grues were often a warning that a user should start looking for a light source... badly. "You have entered a dark area. You will likely be eaten by a grue" was a common description in the Zork adventure games; adventurers going underground would be wise to bring a good supply of oil for a lantern. Once the lights go out, the grues swarm all over you (ripping you apart before the game gives you a death message, like "Grues eat well tonight"). Infocom's official description of the "grue" (notice the lack of plural; it was unclear in the earlier Zork instalments whether there was only *one* grue, lurking as a sinister presence in the underground's darkness... or more then one) is: "The grue, according to scholars of the Great Underground Empire, is a sinister, lurking presence in the dark places of the earth. Its favourite diet is either adventurers or enchanters, but its insatiable appetite is tempered by its extreme fear of light. No grues have ever been seen by the light of day, and only a few have been observed in their underground lairs. Of those who have seen grues, few have survived their fearsome jaws to tell the tale. Grues have sharp claws and fangs, and an uncontrollable tendency to slaver and gurgle. They are certainly the most evil-tempered of all creatures; to say they are touchy is a dangerous understatement. "Sour as a grue" is a common expression, even among themselves."
The Urban Dictionary Mug
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What is there to say? It's a mug, with a word in front and the definition in back. Nicely done!

This will be the perfect gift this winter! It even came in a nice little box. The mug seems to be of good quality. It was a bit pricy, got to be honest, but it’ll be very well received.
Deathless but probably comatose verse This cup is a beautiful mug From which I am happy to chug while engaging in jomo (the obverse of fomo), and pulling the ol' cyber plug.
The mug is just the right size, and the graphics are awesome!
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Would have like the entire cup with purple color. Not just the part with the slogan. It's a nice cup!
Wow! Outstanding mug! I strive to be swoogish one day
It was fantastic very good quality.
Was purchased as a gift . Very well received . Easy ordering . Arrived earlier than predicted.excellent quality. Would recommend to friends and family and will definitely order again in the future.
The mug I ordered came in perfect shape In a box obviously designed for safe shipping. Quality is beautiful and is exactly as described. Thank you!
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Hilarious, I couldn't help but burst out loud in laughter.... !!!
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Great mug, 100% recommend it for all family members! Best gift I’ve ever received!!!
It was so easy to order - and I could play with the syntax of the definition to get it just right. All of this was easy. And quite soon it arrived and is perfect.

Love it!! So true!!
I love 💕 mugs ☘️! These are so lovable. Thanks! I love the urban dictionary writers too.
The printing, the Word and it's definition -- were not quite what I expected. And the same word definition ordered on two different mugs, and yet each was described / defined differently.
Augustine would love the mis-spelling It should be Augustine's Laws. A great book - every engineer, programmer, project and programme manager should read. Based on experience of Defence and Space projects, and with lots of real data to support the tongue-in-cheek advice, it really has more value than all the System Engineering books I've never read. Can't wait to get a mug.
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