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1.To express a state of disbelief.
2.When you hear something that is just down right idiotic/weird.
3.To tell someone to calm down.
1.*someone tries to cut you off in a line*
You:"Whoa moss!"

2.Dude: "Ill touch your cock"
You: "Whoa moss!"
by MeLikeyCandy March 07, 2008
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