Merr

[Sonia]

is an expression that can mean anything. It means so much that its nearly inmpossible to define. Its a word that can express any type of emotion you are feeling. It can also be used to complete or take the place of certain words.
Origin:
Jackie, Mike, Caroline
Second Period Humanties II 2006

[Britney]

Meaningless noise that can be used to mean anything, depending on body language and vocal tone.
A common use is as a greeting. For this, the body language needs to be firendly - smiling, raised arm etc - and the word needs to be said loudly and clearly. It is particularly effective if the word is held on (in other words, saying merrrrrrrrrrrrrr).
Another common use is just to drop it in moments that lack conversation, or to express boredom. Again, it works best to hold the word (merrrrrrrrrrrrrr), and to say it only through one half of your mouth as if muttering.
It can be used as a way of agreement. In these cases it should be short, clear and often preceeded by ah.
The word comes from Buckinghamshire, UK and is the nonsesical muttering of a certain someone.

[Sarah]

its the sound that a retarted cow makes

[Little_Girl]

The equivalent of the word meh.

[PussyCat]

used when angry when no other words will express how you are feeling

[Sonia]

Refers to hey MERR!, which is often spoken in anger, offense, or confusion.

There is no correct definition for this because no one knows what it means. Not because you are not smart enough, but more likely the creators of this word where drunk at the time.

WARNING!: The oral pronunciation of this word is often followed by unexplainable laughter or uncontrollable vomiting.

[Luis Fok]

a word used when a person is irritated, confused, or about to burst out laughing. Can be used randomly and for no reason.

[PussyCat]

More, sarcastic.