A defence mechanism in any slightly confrontational situation that can either be hilarious if used in an innovative way or make you look like a complete idiot (hence the phrase being common place with chavs and other nonentities).
# please a your mum joke can only be humourous if you use a mocking voice to show that you are merely taking the mick out of someone who would use sucha phrase and think it were hilarious (i.e. a nonentity)
reasonably good use of the phrase-
fred: 'my word it is hot today'
george: 'so was your mum last night after i roasted her over the table (alright, gigidy gigidy!)' #said in a mockingly moronic tone

bad use of the phrase-
Ben:'did i here you got an E in english language Lewis?'
Lewis: 'your mum (wayyyyyyyyy)' #said in a hereditary moronic tone
by dan baylis March 22, 2007
To be used in several, subtely different ways.
Situation #1
A: "Your gay*"
B: "Your mums gay"
A: "Your face is gay"
B: "Your ex is gay"
A: "True"
B: "oh noes!"

*In this situation, the term gay is used in a non-derogatory to homosexuals kind of way. In this context, it means stupid and annoying.

Situation #2
A: "You know xyz..."
B: "You know what, your mum"
A: "YOUR mum!"
B: "Yeah well, your mum sucks cock"
A: "Well, your mum sucks my dads cock"
B: "You suck cock"
A: "Your face sucks cock"
B: "Your ex sucks cock"
A: "True"
B: "oh noes!"
by Izzy Pop May 05, 2006
A phrase that can be substituted into quotes to make them funny.
"Pitiful Mortal. Your mum ends here! And your meaningless existance with it!" ~ Seymour Flux, FFX

"Gwa-ha-ha and your mum are up to something." ~ Cait Sith, FF7

"Sin is my old man. Sin is your mum." ~ Tidus, FFX
by Steaver370 November 23, 2004
A word commonly used in brighton when describing a sexual act with the mother of the person the insult was directed at.

a greeting when meeting friends.
i had your mum
love your mum; sucky sucky $5, love her long time
all yourmum are belong to us.
by James Hodge September 29, 2004
1. The woman who gave birth to you
2. Attempted insult,or come back, normally from a townie , normally pathetic, normally not very insulting, normally making little or no sense.
1.... explains itself doesn't it?
A)Townie: Are you Jack Osbourne?
Me: No, my name's Chaz
Townie: Your Mum's Jack Osbourne!
B) <townie is standing in middle of path so people cant get past, cos he's such a badass>
Me: can you get out the way please?
Townie: <leaving quickly> your mum for men!
by Chaz April 17, 2004
an insult targeted towards another persons mother.
idiot: insert insult here
other idiot: YOUR MUM!!
by Joey June 13, 2003
A phrase commonly used by people with two gay fathers. It is often mistaken for an insult but is actually a cry for help from someone who is upset because their dad fucks their other dad.
Person 1:'I hate you because you have homosexual parents and I am strongly yet inexplicably against homosexuality'

Person 2:'your mum'
by Tim December 03, 2003

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