Mid-City English bot, from Old Gentilly English bt. See mom and 'dems in Metry-Bucktown Roots.
n. 1. One's mother and extended family.

In usual reference to extended family like the husband of aforementioned mother and/or uncles, aunts, cousins, deadbeat siblings still living at home.
"Hey! How's ya momenem?!

"We goin' over to momenems'!"
by Who Dat?! January 30, 2004