1. A hidden place; interior of a building.

2. A fancy word for vagina.
Dude 1. *whispering* dude so I got with Vanessa last night.
Dude 2. *whispering* Did you visit her penetralium?
Dude 1. *whispering* Heck yeah Dude 2.
by Soulful_Gingee October 11, 2017
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