piggybacking 1. A method for passing {acknowledgement frames} and {data frames} in the same direction along a line. 2. The practice of increasing memory capacity by soldering chips on top of other chips. The chip-enable or high address pins would be connected to the {address bus} by a flying lead. Many {Ohio Superboards} were expanded to a massive 8K of {RAM} in this way. (1994-11-29)