When a young man reaches puberty and begins to grown a mexican like stash on his upper lip...this stash is used for getting,cleaning up the muff nuggest left behind by ladies
"Damn son...that womb broom is growin mightly well, go see if your mother needs and little cleaning on her muff"s
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.