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15.
Ya mum is commonly used as an irrefutable comeback when properly used. The result is best if it implies something to do with the insultees mum being sexually active. Being females the results are funny as we dont REALLY like ya mum.

(Works best when a straight female says it to add confusion)
e.g

Davo: Hey cockhead.
Bobbio: Your mum likes cockheads.

or

Davo: What were you doing on the weekend?
Bobbio: I was doing ya mum doggy style.

or

Davo: Oh My God! I was so excited.
Bobbio: Ya Mum was excited, when I shagged her!
by Sarah And Kitty April 28, 2006
 
1.
the answer to practically every question in the world
Who? Ya mum
Where? Ya mum
When? Ya mum
What? Ya mum
Why? Ya mum
by steve November 11, 2002
 
2.
If someone is teasing you, you can just put "ya mum" infront of their comment and you have a better comment.
Ben:Your gay.
Tommo:Ya mums gay.
Ben:Your a fuckwit.
Tommo:Ya mums a fuckwit
Ben:Fuck you.
Tommo:Fuck ya mum.
Ben:Go away.
Tommo:Tell ya mum to go away.
by Darren Thomson April 28, 2005
 
3.
answer to almost anything
you're a dickhead
ya mum's a dickhead

why didn't you go to skool yesterday?
Because of ya mum
by taylor March 11, 2004
 
4.
a derogative term used in conversation that u either a) cant be bothered getting involved with b) do not understand OR c) have no relative input towards
a) i have a boil the size of russia...
"so does ya mum"

b) the root of 4980923 squared becomes a positive indice when u cube it and times it to the negative power of 4...
"ya mum"

c) my wardrobe is pink
"ya mum"
by manda August 23, 2003
 
5.
common insult i use in my every day life, being a strait female it is quite ammusing to see the reaction of the insulted
so what did you do for the long weekend?
yamum
 
6.
a uselessly funny phrase used when you can't think of jack all 2 say. I use it at least once every day.
"How ya goin'?"
"YA MUM"

"Yo fat mole"
"YA MUM"

"Suck my cock"
"suck ya mums cock"

"Your fat"
"YA MUM"

"what were you doin last night?"
"YA MUM!"
by Bend Over June 08, 2004
 
7.
awesome come back, espescially when u have no idea what the insult meant
Wanker: "wow, you are such a dumbass"
You: "maybe so... but i fucked your mum sideways twice up the clacker and she kept screaming for more"
Wanker: *shut down*
You: *awesome*
by nick santos March 07, 2005