“I'm so out of touch with pop culture these days.”

You're talking to a coworker and she mentions a popular TV show. You don't watch TV, so you've never heard of it. In fact, you don't know much about new TV shows, music, movies or politics. You tell her:

I'm so out of touch with pop culture these days.

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“It just wasn't very believable.”

You watched a movie. You weren't able to enjoy it because you thought the characters and the setting were to unrealistic. You're discussing the movie with your friend, and you say:

It just wasn't very believable.

just (not)(adjective)

"Just not" expresses the feeling that, even though you want something to be true, it's not true in reality. There's a phrase that was made famous by the TV show "Sex and the City", and later used as the title for a movie:

He's just not that into you.

Being "into" someone means that you like them a lot. This sentence was told to a woman who was worrying about why a man who she'd gone on a date with hadn't called her back. When she heard "He's just not that into you," it convinced her to stop worrying about it.

(a story) (is) believable

The word "believable" can be used to describe a story that's realistic enough for you to accept. When you see or hear it, it makes you feel like it could be real (although you know that it's not real). "Believable" is mostly used to talk about stories like movies, TV shows, and books. The opposite of "believable" is "not believable". You've probably heard the word "unbelievable", but that word means "amazing" or "wonderful", so its different from "not believable". People don't use the word "believable" to talk about stories, explanations, or descriptions of real events. When someone describes a real-life event and you think that it might be true, you say that it "seems plausible":

That seems plausible.

When it seems like it probably isn't true, you say that it's "not plausible":

Yeah, he says that they agreed to pay him five thousand dollars, but that just doesn't seem plausible.

“They did just a phenomenal job on this event.”

In a meeting for the entire staff, the Marketing Director is complimenting how well her employees put together an event & she is extremely pleased. She says:

They did just a phenomenal job on this event.

just a (adjective)(something) / (be) just (adjective)

When used in this way, "just" means "very" or "completely". It can be used with positive or negative adjectives:

That meal was just delicious.

This was just a horrible, horrible idea!

When you're using "just" in this way, don't stress the word "just". Stress the adjective that follows it:

They did just a phenomenal job.

do a good job on (something)

This means to do something, like an assignment or task, well.  You explain what the task was using "on___"

You can use other positive adjectives instead of "good":

They did a great job.

She's doing a fantastic job.

We're doing a pretty good job on this.