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When you say someone has the ability to do something, and it would be advantageous to do so; they should.

However, it usually means "you better fucking ... bitch!" just in kid-friendly tone.
Jane: You should stop drinking.
Bob: You better fucking make my dinner bitch!
by Jimbho February 13, 2008
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A word used to describe something that could happen but likely will never due to a standard lack of caring, ethics, or general sense.
Person 1: "William should unplug that garbage disposal before he sticks his hand in there".

Person 2: "20 bucks says he wont".
by kingatomsk January 19, 2017
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Like could, only replace the c with a sh.
Dude 1: C--
Dude 2: Sh!
Dude 3: You should.
Dude 4: I don't know...
Dude 5: Do it!
Dude 1: Okay.
by Hampikizzel Fo' Shizzel May 28, 2005
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Is/Will definitely not. Contrary to it's primary definition, when used in project management, software development or general troubleshooting, this term converts to the opposite of it's intended use.
Example 1
Tom: I've fixed a few things. The system should be up now.
Sarah: Thanks! Wait, it still doesn't work.
Tom: Oh sorry, I should be able to get it working before I leave for vacation.

Example 2
Amy: The project should be done by the end of March.
Greg: (In September) We've encountered some unexpected delays in the project and are a few months behind.
by scpeezy August 22, 2018
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