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A phrase used to fact check someone or to state something that you are 100% positive without a doubt to be true.

When one puts something on moms they are typically backing a statement by saying that if they are lying then they are disrespecting everything their mother has done for them. Therefore if you lie on moms your are scum of the earth and should not be associated with.
Me: Bro remember that hot chick from high school with the yoga pants?

Homie: yeah?

Me: we smashed the other day. She hit me up on snap outta nowhere.

Homie: cap

me: nah ong

Homie: on moms?

Me: yeah... I was cappin.
On Moms by Chilerd February 28, 2021
Something that 12-17 year olds say when they are trying to make something sound real
Yo bro on moms that bitch sucked my dick
on moms by Shmuel Calories June 18, 2018
Can be used when saying “oh is that right”/“oh for real” or “yooo, that’s riiight”/“no way that dope”. Showing excitement towards something cool.
“Yo i can’t believe I finally bought my dream car, the Dodge Hellcat SRT

“On Moms, that’s good to hear”
On Moms by urswaggyleo March 4, 2022

i took a dump on your moms chest

The end-all be-all phrase that has the power to end any verbal argument. Once spoken, your opponent will be so much in awe that he will quietly back away.
Brendan: Glass isn't a true solid.
Devin: Your moms a true solid. And so was the dump I took on her chest.
Brendan: ::backs away slowly::

Moms on Farmville 

And you thought Moms on Facebook were bad enough...now they are on Farmville...
What's worse Moms on Farmville or global warming? What happened to the days when moms were good influences on their children. This is the dawn of the end of the world.
(On the phone with my mom)
Hey Mom! What are you doing?
Just harvesting my plants?
Oh, cool what are you planting?
Blue trees and rainbow apples.
Oh, so you're on Farmville again...
Yes and I need neighbors!
But, Mom, Farmville is for losers and Moms...
(Mom hangs up)

Dude, Moms on Farmville...
Sounds hot...i would visit their garden and harvest them anytime...
Moms on Farmville by whojew2 January 19, 2011

on the moms 

a phrase used to swear on your mom that you're not lying; to promise
"I didn't drink your beer!"

"Put it"

"On the moms!"
on the moms by jt1234 August 18, 2009