Nevertheless, my online friend Ang requested that I put something on this page, so she recommended

XIPHIHUMERALIS [noun]
Pronunciation Ziff-ah-humour-ahl-is or That X Thing
Meaning A muscle on a cat in the neck / shoulder area.
Usage "What's wrong with Fluffykins?" "Nothing much. She's just pulled her xiphihumeralis."
Origin Haven't the foggiest. Ang's teacher probably made it up as a punishment for something.