The coworker who immediately upon entering the workplace becomes an attached pain in the ass until the end of day. Usually accomplished by a war against silence or personal space.
Only nine hours until this ass hatchet can be safely removed.
The term a cyclist uses to describe what their bike seat feels like after it has become extremely uncomfortable due to either the duration of a bike ride or the number of consecutive days of bike riding.
By the fifth day of the Bicycle Ride Across Nebraska (BRAN), I could swear my seat had turned into an ass hatchet.