The name given to a random person who's name you do not know that somehow gets caught in your conversation and/or argument with another person you know.
From the Seinfeld episode "The Butter Shave" where an innocent passanger seated next to Elaine and Putty on their plane ride back to New York is refered to as 'vegetable lasagna'.
Putty: Oh, tell me about it! I don't know why I ever took you back.
Elaine: Oh please, I took you back! You know it, I know it, vegetable lasagna here knows it!
Vegetable Lasagna: Please, please! I don't want to get involved!
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