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1.
verb.
To shut someone out is to stop being friends with them without really letting them know. It's a popular tactic among junior high students who are suddenly too cool for their friend(s), but too cowardly to do the right thing.
She didn't invite me to her party, she won't return my phone calls, and she's always hanging out with that new girl now. I can't believe I'm getting shut out! Why, oh why, what did I do?
by Mission December 01, 2005
 
2.
when one team scores five or more points and the other team has none.

only a score of 5-0, 6-0, 7-0 and up is a shut out. scores such as 2-0, 3-0, and 4-0 are not shut outs.
did you win? yea we got a shut out! what was the score? 13-0!
by marc October 18, 2004