Somewhere between fat and fit

A shorthand for feter (fet rhymes with get), which is a unit of length measurement defined as a quarter of a meter. It's close to the unit of feet and is thus pronounced as "feeter", which rhymes with and is spelled in the same manner as meter. It's a compromise unit between imperial and metric systems.

Pronounced “Fat Kent”, Fet Cent is slang that originated in South Shields, England. It means “Fat Cunt”

When you run out of your fentnyl or fenty and you start getting all out of control and start worrying to much and stressing over running out of fet..

Aggravated; Irritated

Regarding the star wars franchise, fet’s luck refers to boba fets luck. Boba fet has had terrible luck in many different scenes and movies. If you’re having a really bad day, and you are constantly being hit with every inconvenience, wear a “fet’s luck” shirt to let the Star Wars fans around you know that you’re having a bad day.