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?
2.
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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