"Swivet" is a fun word. No source I've found has any clue of its origin, but all agree that it's an informal
word, most commonly used in the phrase "in a swivet." The definition is a little vague: some kind of condition of excited distress
: different definitions give synonyms as "in a snit
," "in a state
," "in a sweat
," "in a tizzy
," "in a huff
." So a swivet can be an emotional state of anything from anger
There are also two other independent definitions of "swivet" which both come from combinations of separate words. In line/country dancing, a swivet is "a two count move where one foot does a pivot and the other foot does a swivel at the same time."
International Source for Ergonomics has apparently trademarked "swivet" as a name for a swivel-and-tilt (hence the name) surface for one to use a computer mouse on.
Worksurfaces.com and a few other electric/electronic work supply sites advertise a product described as a brass grounding swivet which rotates while maintaining a constant connection with ground to assure personnel protection, but I haven't found if this swivet comes from swivel and tilt, pivot, or some other source.
There also seems to be Swivet Records, which released "Life Religion & Love" by Thrill Deluxe, and Swivet Music, which is credited with Dann Gunn's "Floating, Spinning, Upside-Down" album.