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Mombutt happens almost immediately after the birth of a ladies first child. The hips widen from birth, stretching the cheeks to appear much flatter. There will be a slight upside-down heart shape starting a the center crack. That outlining will sink back down into the thigh with the finish of every step. Mombutt may deviate, but will always start with the presence of Mompants.
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mom butt 

Unflattering description of an older woman's big, fat, lumpy, out-of-shape, cellulite butt.
Dude, your new ho has a big, fat mom butt.
mom butt by JohnstonGuy August 24, 2005

mom butt 

To have a butt as large as an older female.
That guy Beau has Mom Butt.
mom butt by V. Long August 12, 2003

Mom Butt 

When a female (usually an older woman, particularly a mother) wears unflattering, waist high jeans that give the buttocks a flat, unappealing look. It may sometimes entail wearing sweat pants bought from your local Walmart. Also note the buttocks may possibly look as if there is a large amount of cellulite. Either way, you don't want that.
Those Dungarees totally give that girl a mom butt, but I am desperate..
Mom Butt by TrustMe, Really November 12, 2009
Having a fart come out of your ass that sounds exactly or similar to a Cow's Moo.
"DAMN, my butt just mooed....I have MOOBUTT!"
MooButt by Anal-Fissure July 18, 2009

Soccer Mom Butt 

Damn Sarah you have a total soccer mom butt
Soccer Mom Butt by stutes magoots November 23, 2009

Millennial Mom Butt 

A woman age 27-42 that has a mom butt.
Those yoga pants really show off Misty’s MMB (Millennial Mom Butt).