(thing) by Woundweavr Sat Nov 13 1999 at 14:28:10
To ride on the back of someone else.
Often means to sneak in, metaphorically or literally, on while someone else enters.
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(idea) by sl0throp Tue Apr 04 2000 at 21:23:24

Also refers to a technique in computer networking by which two different kinds of message are combined into one packet to improve efficiency. TCP implementations piggyback ACKs with sent data packets, for example.

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