Birthing Hips 

When a person has a pelvic area that looks suitable for birthing.

One friend to another:
Boy those sure are some birthing hips you got their.

Your aunt who lives in the old country:
Girl you should find a nice boy and have a nice bunch of babies with him having those birthing hips and all.

Birthing Hips by Mike "freshman" R August 24, 2011

Birthin’ Hips 

Reference to a chick with a wide pelvis thought to be ideal for spitting out babies.

My girl’s got them birthin’ hips. She gonna be spitting out kids as soon as we ties the knot.

Birthin’ Hips by Eaton Holgoode January 14, 2019

Berthing hips 

When a fat ass breaks his chair and blames it on his wife

So there we were camping and tim pulled the old berthing hips again

Berthing hips by Dolceglr32 October 18, 2019