shutยทup (shuht-up)
--interjection
1. An expression of disbelief.
2. Amazement; astonishment.
Also,
--adjective
1. An intensive used to express satisfaction, acceptance, pleasure, excellence, exaltation, approval, awe, or reverence- the level of satisfaction is proportional to the charismatic level of the expression.
For instance, you arrive at a boring kids carnival, you'd rather be golfing or fishing, but across the way you see it..."Shut-up, they have blue cotton candy".
Another way of saying, "you've won the arguement, but I'm not going to admit it".
Girl: Why are you speaking in a French accent?
Guy: Because I'm speaking French...
Girl: Shut Up.
Guy 1: That girl is such a slut!
Guy 2: No she's not; she's had one boyfriend in the past year and didn't even have sex with him
Guy 1: Shut Up.
Wife: Do you want the big half or the small half?
Husband: That's impossible as two halves would be of the same mass, so a larger/smaller half is not possible
Wife: Shut Up.
Student 1: From now on, If anyone comes into this lesson they are marked as late
Student 2: I don't think that's your decision to make
Student 1: Shut Up.