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1.
The triangular gap between a woman's upper thighs, immediately beneath the vulva.

From the evocative shape of said void and the habit of some who like to slide the eponymous chocolate treat through it.
Woman: Do these jeans make me look fat?
Man: No, but they do accentuate your Toblerone tunnel.
by Tama Boyle January 31, 2007

Words related to Toblerone tunnel

gap void child-bearing hips christchurch gape hips vagina vulva