noun

• (obsolete) A thing whose name cannot be remembered; thingamajig, doohickey.
• Any device or machine, especially one whose name cannot be recalled. Often either clever or complicated.
• (informal) Any consumer electronics product.
• (computing) A sequence of machine code instructions crafted as part of an exploit that attempts to divert execution to a memory location chosen by the attacker.
• (computer science) A technique for converting a part of one problem to an equivalent part of another problem. Used in constructing reductions.