It's always nice to have a spare kidney handy, in case you're planning on going on a week-long bender or something. Or in case of unicorns.
Say, wait a minute... this kidney looks familiar.
Cannot be traded or discarded
: spare kidneys
- The Black Market (2,000 Meat in Bad Moon)
|You pop your kidney back into place. Ahhh, that's better!
- The line about unicorns is a reference to "Charlie the Unicorn", where Charlie's kidney is removed by his fellow unicorns. The same short is referenced in the original adventure in which your kidney is stolen.