What does "be tied to" mean?

What does "tune out" mean?

To "tune out" means to stop listening or paying attention! Ex: Sorry, can you repeat what you just said? I tuned out. Ex: Jerry, when you watch TV, you tune out.

What does "fast forward" mean?

In this context, "fast forward" is a phrase used to imply that unimportant information in a story is being skipped over, and the story is continuing where the speaker wants it to continue. The phrase originates from pressing the "fast forward" button on a tape or VCR player to skip through a song or movie.

I don't understand what "crawled up your ass and set up shop there" mean here. What's it mean?

This is considered a vulgar sentence. It implies that something is "up his ass," which means that he's rude and easily offended or uptight. This is considered an offensive statement, so just be careful where and to who you say it! Ex: What? have you got a stick up your ass or something? Ex: The woman acted like she had a stick up her ass the way she treated us.

What does "undercover" mean? Does it have the same meaning as hiding?

It is similar to hiding! "Undercover" means someone hidden as something else. It also means secretive. Ex: This is an undercover police investigation. I can't tell you anything about it. Ex: I'm a spy, but I'm undercover as an artist working in this gallery! Ex: Are you undercover?

What's "gear up" mean?

"Gear up" means to get ready/prepare for something. Ex: I'm trying to gear up for my final exams on Monday. Ex: Politicians are already gearing up for the next election.