It is another form of saying swear on my mums life, by saying say mums you are trying to prove something
by 🖖🏻👸🏽☺️❤️ October 1, 2016
Get the Say mumsmug. by Skinzlil May 16, 2019
Get the Say Mumsmug. 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
Person 2: Yeah bro of course
Person 1: Say mums
Person 2: Mums cuz
by sheskimo October 19, 2020
Get the say mumsmug. by UrbanSuctionary March 19, 2017
Get the Say Mum'smug. 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..?"
*Smack*
"What did you say about my mum? (What you say about my mum?)
"Umm nothing..?"
*Smack*
by Snowberry Glitterdust Montblanc October 26, 2005
Get the What did you say about my mum?mug.