Say Mums 

When someone doesn’t believe you so they say “say mums” to make sure you’re not lying

“Wagwan my g, I smashed that girl”
“No wayyyyyy! Say mums”
“Mums”

Say Mums by Skinzlil May 16, 2019

say mums 

A statement used to replace a term such as "Swear to God" to really put the point across that you're telling the God honest truth. If it's obviously a lie and someone claims "mums", their mum is thought to die.

Person 1: Did you transfer me the money?
Person 2: Yeah bro of course
Person 1: Say mums
Person 2: Mums cuz

say mums by sheskimo October 19, 2020

Say mums 

It is another form of saying swear on my mums life, by saying say mums you are trying to prove something

Derek- I just found £50

James- sure mate

Derek- say mums I did

Say mums by 🖖🏻👸🏽☺️❤️ October 1, 2016

Say Mum's 

A request for the announcer of an unverified fact or story to "swear on their mum's life".

You've got a trial with Watford? Say mum's!

Say Mum's by UrbanSuctionary March 19, 2017

Say mum's

A statement that can be used to express disbelief, similar to "swear to God" meaning "swear on your mum's life"

Ryan: yo I just found 50£ on the ground

Chris: say mum's

Ryan: mum's bro

Say mum's by pepe_4206 February 21, 2026