I was just reading about Personal Slanguage on another blog, referring to slang and made-up terms that enjoy use by a group of friends or family members and sometimes spread wider. I'm glad to know that there is a term for this because I have a couple:
Sampagne -- this is sparkling cider or any type of non-alcoholic champagne. (Martinelli's is one brand.) My spouse Sam does not drink, but loves this stuff. Any time we're having champagne (even at our wedding), we also have Sampagne on hand.
Leg Wrapper -- this refers to something that a woman finds sexy: because it makes her want to wrap her legs around someone. I made this up as a movie review term, so I could clue my girlfriends into date movies, but a book or other media could be a leg wrapper, also.