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1.
Humourous response to any question where a noun or noun-phrase is expected.

See also: Yer mum
Q: What time is it?
A: Your mum.

Q: Under which of the true sciences should philosophy be classified?
A: Your mum.

etc.
by phantom oddity January 09, 2004
 
2.
probbably the most immortal phrase to bless this great earth. It may answer any question, and cause great havoc.
Q)"what is the square root of 81"

A)"your mum is the square root of 81"


Q)I got Monopoly for Christmas"

A)Your mum got monopoly for Christmas"
by Jonass May 08, 2005
 
3.
the best response to any question. can be used on numerous occasions including insulting someone, an answer to a question you dont know the answer for, just for the hell of it or in concjuntion with a sentence. NB: it is important to find out about the status of the other person mother i.e. if something upsetting happened to her etc so no true insult is caused. P.S. the only people who WILL get really insulted then are silly or stupid and dont understand it is a joke and think you are really out to insult their family...
Percy: S'cuse me you've got something on your face.
Pat: Your mum's got something on her face.
Percy: okkkk... I havent got anyone to go to Prom with.
Pat: I'm going with your mum.
Percy: stop saying your mum!
Pat: your mum
Percy: your face!
Pat: *silence*
Randomer: Percy dude that was harsh!
Percy: sorry Pat your actually really pretty, will you go to Prom with me?
Pat: I already told you i'm going with your mum!
Teacher: Percy stop talking in my lesson. Whats the answer to question 4?
Percy: Your mum?
Teacher: DETENTION! (note the inappropriate last use here where percy just doesnt know where to stop or how the phrase is used...note Pats master skills FYI she doesnt reall want to go to prom with percys mum duh!)
by allknowingteen December 09, 2005
 
4.
a comeback to a question or insult. it is beautiful in its simplicity in that those two words will imply that the person's mother is fat, baggy, saggy, ugly and would probably simulate coitis with anything that got in her way. the only acceptable comebacks to a display of 'yourmummery' are shown below:
Cardy: Hey, what's that smell?
Daly: Your mum.
Cardy: Your face.
Daly: Your mum's face.

(on NO account bring 'your dad' into this - that's just rude.)
by Daly January 26, 2004
 
5.
Possibly the greatest insult ever, due to the sheer randomness of it.
Bob: Do you have the time?
Fred: Your mum
Bob: Shut up, you fag. Why do you have to be such a fag all the time?
Fred: Your mum! Your mum, that's why!
by Tempestua December 05, 2004
 
6.
Widespread, ineffective insult globally used by townies, kevs and their offspring. Used as a counter insult by citizens with the I.Q of a bucket of sewage water (and the B.O of one)
Your mum originated, presumably, in the UK, which just adds another thing to the list that we'll be embarrased we thought of when we look back at this 10 years from now
Your mum is effectively dead towards punks, grungers, and emos, and ironically has been added to their arsenal of townie impressions.
However, mentioning 'your mum' to a townie or similar missing link of the gene code may result in serious bodily harm, so if you do have to insult them, use words with more than 6 letters to leave them stunned and confused.
A: Fuck you
B: Fuck your mum

A: You're gay
B: Your mum's gay
by Gary February 18, 2004
 
7.
"your mum" is the ultimate answer
what's six times nine? your mum! (i always thought there was something fundimentally wrong with your mum)
by chuckyanutsup June 18, 2005