Top Definition
The curving arches on a pair of nice boobs. Best observed from the navel upwards.

While gazing into the boobarch, you will observe the curving upward sweep of the boob proper and the surmounting nipple peaks.
Guy A : Dude did you see the boobarch on that chick?
Guy B: Yes man, that was like totally an equilateral pointed arch.
by Tragopan June 06, 2012
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