n. the amount a container lacks of being full
the phone rings---
Ensign: How did you know it was me?
CMMDR: Its four a.m. This better be important.
Ensign: Can I ask you a question?
CMMDR: Jesus, what?
Ensign: I'm sorry, are you busy?
Ensign: As regards your career-
CMMDR: Does it have an extreme amount of ULLAGE?
Ensign: YES! And?