vi. 1. [techspeak] During the execution of a procedural language, one is said to 'unwind the stack' from a called procedure up to a caller when one discards the stack frame and any number of frames above it, popping back up to the level of the given caller. In C this is done with 'longjmp'/'setjmp', in LISP with 'throw/catch'.
See also smash the stack.
2. People can unwind the stack as well, by quickly dealing with a bunch of problems:
"Oh heck, let's do lunch. Just a second while I unwind my stack."