taco neck
n.— «On a Tuesday afternoon in March, I woke up with what I call “taco neck.” The muscles on one side of my neck had locked, and my head leaned to the other side, as if I was about to take a bite from a taco.» —“Ending with a question” by George Rede The Oregonian (Portland) June 2, 2008. (source: Double-Tongued Dictionary)
Further reading
A Francophone who’s feeling low might say so with J’ai le moral dans les chaussettes. The idiom avoir le moral dans les chaussettes means “to have morale in your socks.” This is part of a complete episode.
Related
An anadrome is a word that forms a whole new word when you spell it backwards. For example, the word “stressed” spelled backwards is “desserts.” Some people’s first names are anadromes. There’s the girl named Noel...