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A roommate who acts like your mom by tucking you into bed when you're drunk, making you dinner, bringing you medicine when you're sick, and of course picking you up and dropping you off at parties, friend's houses, school, etc.
Becki is the biggest mommate because she had to remind Jess to frequently apply sunscreen in Cuba.

Leah had to tuck Chantelle into bed when she was too drunk to manage on her own. What a nice mommate!

Jess, being the mommate that she is, drove Chantelle, Leah, and Amanda to the bar and told them to have a safe night.
Mommate by 313vagina March 1, 2009
Related Words
A roommate who has the qualities of most mothers. A mommate will nag, belittle, and ultimately make one feel guilty as apposed to arguing.
Example 1

Person one: "Is the mommate home?"

Person Two: "No, we can eat in the living room."

Example 2

Person 1: "I see you finally did the dishes."

Person 2: "No the mommate did them last night but I heard about it five times this morning."
Mommate by pseudominate February 23, 2010

Molemate 

When someone has a mole in the same place on their body as you
Me and John are molemates
Molemate by Lulia February 15, 2018
When you befriend your childs, classmates mom; mom friends you make through your childs class.
Who were you talking to? I was talking to my mommate Ann.

All the first grade moms are friends so they go for a mommates night out once a month.
Mommates by kmp16 February 15, 2019

molemate 

Someone who has a mole on the same place on their body as you
Fraser and Lucy are molemates
molemate by Lulia February 15, 2018
Malmate is to pour milk into your friends anus and then using your fist to stir it in with their diarrhoea.
Me and Ryan are off to malmate freddie, you coming?