When placing a plate of brownies down infront of his drunk friends, Tom said "have at it boys".

After seeing Sean get punch repeatedly by the opposition in the middle of a maul in a rugby game, Tom grabbed the offender in a full-nelson and positioned him face-first to Sean, saying "have at it".
by Dirty Little Tommy August 03, 2005
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When someone is unwilling to accept the current or proposed state of affairs. Can also be used when someone doesn't believe you're telling them the truth.
Bush thought he'd slip Harriet Miers by on a nod and a wink, but the Busheviks weren't having it.

I told my mom I wasn't the one who put a dent in the car, but she was NOT having it and pressed me to give her the whole story.
by The Grammar Nazi November 04, 2005
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When something is seen as required.
"I didn’t have to add any sugar to my mocha latte."

"What do you mean?"

"I didn’t find its taste bitter and disgusting enough to cause me to add more sugar from the office in order to make it palatable for me."
by nanigansguy May 22, 2017
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(noun) A person who does not possess the necessary credentials in order for them to be successful. Likewise, this person is not able to express qualities of credibility.
The networking teacher said that he could not take the day off because he was a have-not and needed to work towards his certification.
by McCrapper March 25, 2013
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