Its another name for closet sex.

The "Broom Room" part is closet (Since the broom is stored in a closet usually).
The "Womb Boom" part is sex.
If you put them together, its closet sex.
"What is "Broom Room Womb Boom"?

"It's when you have sex in the closet"

"Oh really? I lose my virginity that way."
by Henry Jakobsun July 6, 2009
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when a man finishes having sex with a woman and realizes that he has something attached to his manhood that was left by a previous caller.
After having sex with a prostitute Adam realized he had broomed the womb because there was a used condom from a previous client attached to his manhood!
by Superknox1andonly December 23, 2014
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