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1.
female grundle; space between female's vagina and anus
His penis was so large, he ripped my boim.

Last night while having sex with my girlfriend, I licked her boim and she went wild.
door tomlicker 10 juli 2010
 
2.
The moment when, in the British TV show Doctor Who, a new person first enters the TARDIS and realizes it is bigger on the inside. A BOIM stands for a Bigger On the Inside Moment. BOIM's are usually accompanied by running around the TARDIS, and gaping.
"Whoa did you see Rory's BOIM last saturday?"
"Yeah it was hilarious!"
door theoncomingstorm version 11 30 september 2011
 
3.
The taste of a girl's pussy when she either is too-close to her period or peed recently.
Sheri always seems to taste like fucking boim, what a sloppy cunt she's got.
door threepenispenispenis 13 juli 2010