Just so you know, it IS "Lil." She comes into Colonel Potter's office and says "Who'm I drinking with?" Introductions all around. "What's the BJ stand for?" "Anything you want." Then Potter and Lil start chatting, but in the background is an entire little rant between Hawkeye and BJ as to what it DOES stand for.
(I know this by heart. You could say I'm a MASH fan.)