1. [noun] (electronics engineering) An improvised device, usually crudely constructed. Typically used to test the validity of a principle before doing a finished design.
2. [noun] (general) Any construction or practice, typically inelegant, designed to solve a problem temporarily or expediently.
3. [noun] (computing) An amalgamated mass of totally unrelated parts forming a distressing whole.
4. [verb] To build or use a kludge.
5. [noun] A badly assembled collection of parts hastily assembled to serve some particular purpose (often used to refer to computing systems or software that has been badly put together).