OK well i wrote 'Shut UPPP!!!' like this to demonstrate a higher pitch at the end of the word 'shut up'. There is more emphasis on the 'up' - if you watch something like 'Mean Girls' you will see this used a lot. It is an example of a word that has had its meaning changed in very recent years by the younger generation. (i.e. my generation! Although mainly in America, less so in England, at least for this example). So 'Shut up' in this context simply means 'No way', 'You're joking' or 'You're kidding'. Understand?
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I gave an example of zip it above:
Becky85 said:
It means 'be quiet' or 'shut up'.
For example:
Mother: Be quiet.
Child: But I...
Mother: I said zip it!
Another would be...watch the Austin Powers films, specifically the first one I think, when Dr Evil is talking to his son. He tries to tell him to be quiet, using a number of phrases including:
Dr Evil: Sshhh
Scott: But I....
Dr Evil: I said sshhh
Scott: But Dad, I...
Dr Evil: Zip it!
Scott: This is so unfair, I....
Dr Evil: Scotty I said zip it!
Or something like that anyway! Hope that helps!