1. A vagina filled with jizz.
2. A person who is just as attractive as a vagina filled with jizz, usually used to describe females. The male equivalent is jizzbag.
3. A slut.
1. Man I really stuffed that jizztube!
2. I wouldn't want to blow a load in that jizztube.
3. See that chick there? She's such a jizztube.