1) when someone is talking about something that nobody cares about and is giving to much information

2) when someone is talking and you say "shut up" just quiet enough for them to not hear it but they ask "what did you say?"

(usually said calmly. not exclaimed and never to loud. UNLESS they ignore you then you say it louder.)
dude 1: I have to go the play after school because my teacher said she'd give me extra credit, and I need it because I'm failing and my dad says--

dude 2: shut up.

dude 1 : that I wont get my lisence if I dont pass--

dude 2: shut up!

mother: I have a list of chores for you to do that I left on the counter and I want them--

me: shut up.

mother: done when... what did you say?

me: whaa?
by duffffmaann May 22, 2010

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shut·up (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".
by Michael DeFant September 22, 2007

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shutup in fact means i love you
jesse, shutup..no really, shutup.
by jen December 03, 2004

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A quick way of saying "be quiet". Often this term is unliked by adults, they think it's rude.
"Why don't you just shut up?"
by The Human Being/Person December 04, 2016

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A mrod uttered at the end of an arguement by the loser of the arguement.
Odin:
Apollo is a god not a titan.
B.B.McG:
Shutup
by Odin February 01, 2004

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To tell the person sitting next to you not to speak to you in a convincing way.
Person 1: "Hey dude you over there."

Person 2: "yeah"
Person 1: "Shut Up"
by Jwally 35 July 30, 2009

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Main term is to cease talking. Other is a saying people (mainly girls) will say when in disbelief.
1: "Shut up and stop talking you freak!"
2: "You met Sean De Paul in Indy? SHUT up!!"
by Shina August 30, 2006

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