1. Have a blast

If you want to wish someone to have a good time on their vacation, “have a blast”
is a good phrase for you to say. Another usage of this sang word is to talk about your
amazing or fun time you had. Let’s see the following examples:
-I can honestly say that this has been a fantastic dinner, I had a blast.
2. On fire.

This slang word is often used about people. It means it is going very well. Let’s
have a look at the following examples:
Did you just bake three different cakes for this party? You are on fire!
This slang word can also be used at work. For example:
-Our team is on fire right now, it looks like we will finish this project before the deadline.
3. Next level.

This is such an interesting slang word which can be used to refer to something
good or bad or something goes beyond normal or average level in a impressive or
ridiculous or bad way. Let see the following examples:
-Wow, your speech was next level.
-He is showing his improper manner, like next level.
4. Nailed it.

When you want to compliment someone for their good performance, then this is a
slang for you. It has the same meaning with “ you did a good job”. For example:
-The presentation was very excellent. You nailed it.
5. Legit

This slang word has two meanings, either extremely good or literally real or
authentic. For example:
-We’ve got to try new coffee on that restaurant. It’s legit!
6. Lit

This is a positive one to say something great or exciting. For example:
-Her new play is lit? Have you seen it?
7. In the loop

This one is used by millions of people in offices. It means keep up with the
information or being included on the information or communication. For example, if you
are absent from the meeting, you might say to your friends “Keep me in the loop on that
issue”
8. Kudos

If you want to congratulate someone on something, then this is a good slang word
for you. You can use this slang in all kinds of situations or with your friends. For
examples:
-This performance was interesting! Kudos to everyone on your big success.
-Kudos on the great work. Your messages are helping the poor a lot.