When someone doesn’t believe you so they saysay mums” to make sure you’re not lying
Wagwan my g, I smashed that girl”
“No wayyyyyy! Say mums
by Skinzlil May 16, 2019
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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
by sheskimo October 20, 2020
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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!
by UrbanSuctionary March 19, 2017
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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
by 🖖🏻👸🏽☺️❤️ September 28, 2016
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A phrase normally used by Chavs to indicate he wants to fight the person he says it too (usally the person is involuntarily put into the situation).
Chav sees non Chav person passing him (them) at night.
"What did you say about my mum? (What you say about my mum?)
"Umm nothing..?"
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