Biggina (noun) - When talking about a woman's vagina, it may incisively be huge in the hole, or the lips, et cetera. When referring to this, simply dub it "biggina", when talking to your friends; this may very well confuse the woman you're talking about in front of, and a very helpful slang word.
Rob - "Hey man, how was that anyway?"
Jareth - "Took me forever dude, you know, Biggina."
Jessica - "What took forever?"