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
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
shutup in fact means i love you
jesse, shutup..no really, shutup.
by jen December 03, 2004
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
what to say if a conversation has gone quiet and it's getting really awkward. also works with lol and cool.
So tanya still wants to get pregnant?

Yeah.

...

SHUT UP EVERYONE!!!!
by jack russell terrier lover April 04, 2011
A much more demeaning way of politly telling someone to shut up.
obnoxious guy: hey! guess what my socks smell like!

other guy: c'mon...shut up...

third guy: both of you shut UP!
by mindfreak94 April 10, 2007
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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