The Vice President of your division at work seems to be really angry about something. She's barking out orders, slamming doors, and yelling at employees. You make this comment about her behavior to a coworker.
Valerie's really on a rampage today, huh?
When you're talking about someone at work with a higher position than you, it's usually normal to address them by their first name if you sometimes speak to them. For example, if you say "Hi" and make small talk with the Vice President of your division once a month, it's probably OK to refer to her by her first name:
Have you submitted this to Jason for approval yet?
If you've never spoken with someone, and they're much higher up in the organization than you, you might call them by their full name instead:
I saw Jason Kaplan in the elevator this morning. He seemed to be in a good mood.
Of course, this is all for corporate jobs in the U.S. It might be different internationally or for some jobs like university professors.
"Valerie's" means "Valerie is" in this example.
"Going on a rampage" means to get really angry, make a lot of noise, and cause problems. The best way to imagine a "rampage" is to think of a wild animal that gets loose from the zoo. Or, if you've ever seen a "Godzilla" movie, you can imagine one of the giant monsters destroying a city.
The other situation that people use "rampage" for is when someone goes crazy and kills or hurts a lot of people. This is a sentence from a newspaper report:
Police say that Jones, age 42, went on a shooting rampage at a local shopping mall, injuring 12.
In the example at top, the speaker says that Valerie "is" on a rampage instead of using "go" or "went". That's because it's still happening at the time. To "go on" a rampage means to start acting that way. While it's happening, you say that someone is on a rampage.
When someone ends a sentence with "huh?" it means that they think you're going to agree with what they said:
"Huh" is common when you're making small talk about the weather, or when you're gossiping about someone.
When someone says "___, huh?" you should respond "Yeah!" if you agree with what they said.
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