[from a common description of recto-cranial inversion]
adj. 1. To be stuck, incapable of proceeding without help. This is different from having crashed. If the system has crashed, then it has become totally non-functioning. If the system is wedged, it is trying to do something but cannot make progress; it may be capable of doing a few things, but not be fully operational. For example, a process may become wedged if it deadlocks with another (but not all instances of wedging are deadlocks). Being wedged is slightly milder than being hung.
Describes a deadlocked condition.
2. Often refers to humans suffering misconceptions.
"He's totally wedged -- he's convinced that he can levitate through meditation."
3. [UNIX] Specifically used to describe the state of a TTY left in a losing state by abort of a screen-oriented program or one that has messed with the line discipline in some obscure way.