Top Definition
Your Bhumtrum is the vertical groove that lies between your lower back and the top of your bottom.

The Bhumtrum comes from the same body-part-family as the Philtrum - The groove between the upper lip & nose.
The groove formation of the Bhumtrum allows for your partner to gently and easily stroke the area in an affectionate manner.
by Coco89 February 02, 2012
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