Mum's 

A shortened version of the popular phrase "On my mother's life".

A: "My dad won the lottery."
B:"I don't believe you, Mum's?"
A:"Mum's fam"

Mum's by BBR2 June 3, 2018

Mum's 

"Mums" is a term used for proving a point to a friend or individual.

1. "Mum's" I did the dishes.
2. "Mum's" I didn't tell the teacher.
3. "Mum's" I swear I didn't do it.

Mum's by Mark-My-Words May 3, 2022

mum's the word 

means to keep this a secret; don't tell anybody

I don't want anybody to know about this affair until next week, so mum's the word!

mum's the word by Venera December 22, 2005

mum's the word 

keep quiet about it (possibly from the sound one makes when trying to speak with closed lips, Attributed to William Shakespeare)

Remember, until further notice, mum's the word.

mum's the word by The Return of Light Joker January 9, 2010

mum’s best 

When one will travel to the deep depths of the earth for her buns. If the buns aint mum’s best it’s not going in my mouth.

Denny refused to hunker down on a brat after seeing the kroeger brand buns on the counter.

Denny refused to hunker down on a brat after seeing the kroeger brand buns rather than mum’s best on the counter.

mum’s best by Bun Police August 25, 2022

Ya mum's a sparky

A quick and witty insult to flabbergast the other person. Works like a charm and acts as the ultimate insult.

Karen: "Your car is too loud!"
Nik: "Ya mum's a sparky!"

Ya mum's a sparky by dogtrue August 8, 2020

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